Add SPDX tags (#28)

README.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 <div align="center">
 
 Production Flow Description Language

docs/examples/concurrency_and_synchronization.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Concurrency and Synchronization
 
 As already stated in the [parallel](../pfdl/parallel.md) section, there is no keyword for the synchronization. The next statement after a parallel block is only started if all concurrently running tasks are finished.

docs/examples/control_structures.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Control structures
 
 ## Condition

docs/examples/introduction.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # Introduction
 
 In this section complete PFDL programs are presented to give a better understanding.

docs/examples/task_input_and_output.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Task input and output
 
 Tasks can define an Input and an Output to pass data when calling each other.

docs/getting_started/architecture.md

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+<!--
+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 <style>
 .figure{
     width: 100%;

docs/getting_started/ci_cd.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 <style>
 .figure{
     width: 80%;

docs/getting_started/glossary.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # Glossary
 
 ## Data Life Cycle Object (DLCO)

docs/getting_started/installation.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 <style>
 .figure{
     width: 70%;

docs/index.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 ---
 hide:
   - navigation

docs/pfdl/comments.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Comments
 
 A comment starts with a hash character (`#`) that is not part of a string literal, and ends at the end of the physical line.

docs/pfdl/condition.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Condition
 Because some production steps needs to fulfill conditions sometimes there is a control structure `Condition` for this specific case.
 The `Condition` block consists of a `Condition` which includes a boolean expression, a `Passed` block in which instructions are given for the case that the boolean expression evaluates to True.

docs/pfdl/introduction.md

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+<!--
+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 <style>
 .figure_1{
     width: 60%;

docs/pfdl/loop.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Loop
 To execute statements for a specified number of repetitions, the usage of the `Loop` keyword is required.
 There are two types of loops available: Counting Loops and While Loops.

docs/pfdl/parallel.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # Parallel
 To exexute Tasks in parallel the `Parallel` keyword is used.
 All Tasks within a Parallel block will be executed concurrently by the Scheduler.

docs/pfdl/service.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Service
 
 A Service in the PFDL corresponds to a service in a service oriented architecture.

docs/pfdl/struct.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Structs
 
 A struct is a collection of variables.

docs/pfdl/task.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Task
 A Task is an executable unit which executes the statements within sequentially.
 The name of the Task should be a [lowercase string](../#allowed-characters).

docs/scheduler/api.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # PFDL Scheduler API
 
 In this section further information about the functions that can be used from the PFDL Scheduler is given.

docs/scheduler/dashboard.md

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+<!--
+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 <swagger-ui src="../../api_spec/http-rest-api.yml"/>

docs/scheduler/developer_reference.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # Developer Reference
 
 ::: pfdl_scheduler

docs/scheduler/index.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # Using the PFDL scheduler
 
 This section can be used as a reference while developing software with the PFDL Scheduler.

docs/scheduler/model_classes.md

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+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
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 # Model classes
 
 This page provides an overview over the model classes which are extracted from the parsed PFDL file. For an overview visit the [architecture section](../getting_started/architecture.md#model-creation-and-validation).

docs/scheduler/scheduler_class.md

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+<!--
+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+-->
 # The Scheduler class
 
 The PFDL scheduler is the interface between the PFDL core (model, petri net) and the outside world. If you want to receive the current state of the Production Order or push it further by sending status updates of the services you can register callback functions and fire events.

docs/stylesheets/extra.css

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+/*
+SPDX-FileCopyrightText: The PFDL Contributors
+SPDX-License-Identifier: MIT
+*/
 :root > * {
     --md-primary-fg-color:        #1f82c0;
     --md-primary-fg-color--light: #ECB7B7;