Add DOCS folder and some pages

Signed-off-by: cmoulliard <[email protected]>

docs/getting-started/index.md

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+---
+title: Getting started
+nav_order: 3
+---
+
+# Getting started
+
+TODO

docs/introduction/index.md

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+---
+title: Introduction
+nav_order: 2
+---
+
+# Workflow YAML Generator
+
+![e2e testing workflow](https://github.com/ch007m/pipeline-dsl-builder/actions/workflows/e2e-testing.yaml/badge.svg)
+
+The Workflow YAML Generator tool simplifies the life of the users when they play with a Workflow engine as Tekton, [Konflux](https://konflux-ci.dev/) to generate their corresponding YAML resource file from a configuration file containing the definition about the Job and the actions/steps using a `common/unified` language !
+
+The application has been designed around the following principles:
+
+- Have a quarkus standalone application able to generate different YAML resource files for a provider: Tekton, Konflux, etc
+- Define the Job and actions using a `common` language
+- Generate using the Fabric8 kubernetes Fluent API & Builder the resources using [Tekton model v1](https://github.com/fabric8io/kubernetes-client/tree/main/extensions/tekton/model-v1/)
+- Propose `Factories` able to generate the Tekton resources such as: params, labels, workspaces, results, finally using `defaulting` values or YAML content from the configuration file
+- Support to specify a domain/group: `example, build, etc` to organize the different resources generated
+
+**Note**: This project is complementary to what Dekorate can populate today for [Tekton](https://github.com/dekorateio/dekorate/tree/main/annotations/tekton-annotations) !
+
+## How to use it
+
+Git clone the project and create the jar file of the standalone Quarkus application:
+
+```bash
+./mvnw package
+```
+
+Create a configuration YAML file where you define the parameters as:
+- The workflow provider to be used: `konflux` or `tekton`
+- The `domain` to group the generated files under the output path
+- A job
+
+```bash
+cat <<EOF > my-config.yaml
+type: tekton
+domain: example
+
+job:
+  name: simple-job-embedded-script
+  description: Simple example of a Tekton pipeline echoing a message
+  resourceType: PipelineRun
+
+  actions:
+  - name: say-hello
+    # The script to be executed using a linux container
+    script: |
+      #!/usr/bin/env bash
+      
+      set -e
+      echo "Say Hello"
+```
+
+and launch it:
+
+```bash
+java -jar target/quarkus-app/quarkus-run.jar builder -c my-config.yaml -o out/flows
+```  
+
+Next, check the pipeline(s) generated under `./out/flows/<domain>`
+
+**Remark**: Use the parameter `-h` to get the help usage of the application
+
+The [configurations](./configurations) folder proposes different YAML config examples of what you can do :-)
+
+## Some scenario ideas
+
+Some examples of configuration are described part of this [document](SCENARIO.md) - Enjoy :-)