docs: added Issue and PR templates (#28)

Signed-off-by: Patrick Zheng <[email protected]>

.github/ISSUE_TEMPLATE/bug-or-issue.yaml

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+# Copyright The Notary Project Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 🐛 Bug or Issue
+description: Something is not working as expected or not working at all! Report it here!
+labels: [bug, triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to fill out this issue report. 🛑 Please check existing issues first before continuing: https://github.com/notaryproject/tspclient-go/issues
+  - type: textarea
+    id: verbatim
+    validations:
+      required: true
+    attributes:
+      label: "What is not working as expected?"
+      description: "In your own words, describe what the issue is."
+  - type: textarea
+    id: expect
+    validations:
+      required: true
+    attributes:
+      label: "What did you expect to happen?"
+      description: "A clear and concise description of what you expected to happen."
+  - type: textarea
+    id: reproduce
+    validations:
+      required: true
+    attributes:
+      label: "How can we reproduce it?"
+      description: "Detailed steps to reproduce the behavior, code snippets are welcome."
+  - type: textarea
+    id: environment
+    validations:
+      required: true
+    attributes:
+      label: Describe your environment 
+      description: "OS and Golang version"
+  - type: textarea
+    id: version
+    validations:
+      required: true
+    attributes:
+      label: What is the version of your tspclient-go Library?
+      description: "Check the `go.mod` file for the library version."
+  - type: markdown
+    attributes:
+      value: |
+        If you want to contribute to this project, we will be happy to guide you through the contribution process especially when you already have a good proposal or understanding of how to fix this issue. Join us at https://slack.cncf.io/ and choose #notary-project channel.

.github/ISSUE_TEMPLATE/config.yml

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+# Copyright The Notary Project Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://slack.cncf.io/
+    about: "Join #notary-project channel on CNCF Slack"

.github/ISSUE_TEMPLATE/feature-request.yaml

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+# Copyright The Notary Project Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 🚀 Feature Request
+description: Suggest an idea for this project.
+labels: [enhancement, triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to suggest a useful feature for the project!
+  - type: textarea
+    id: problem
+    validations:
+      required: true
+    attributes:
+      label: "Is your feature request related to a problem?"
+      description: "A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]"
+  - type: textarea
+    id: solution
+    validations:
+      required: true
+    attributes:
+      label: "What solution do you propose?"
+      description: "A clear and concise description of what you want to happen."
+  - type: textarea
+    id: alternatives
+    validations:
+      required: true
+    attributes:
+      label: "What alternatives have you considered?"
+      description: "A clear and concise description of any alternative solutions or features you've considered."
+  - type: textarea
+    id: context
+    validations:
+      required: false
+    attributes:
+      label: "Any additional context?"
+      description: "Add any other context or screenshots about the feature request here."
+  - type: markdown
+    attributes:
+      value: |
+        If you want to contribute to this project, we will be happy to guide you through the contribution process especially when you already have a good proposal or understanding of how to improve the functionality. Join us at https://slack.cncf.io/ and choose #notary-project channel.

.github/PULL_REQUEST_TEMPLATE.md

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+**What this PR does / why we need it**:
+
+**Which issue(s) this PR resolves** *(optional, in `resolves #<issue number>(, resolves #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
+Resolves #
+
+**Please check the following list**:
+- [ ]  Does the affected code have corresponding tests, e.g. unit test?
+- [ ]  Does this introduce breaking changes that would require an announcement or bumping the major version?
+- [ ]  Do all new files have an appropriate license header?
+
+<!-- If this is a security issue, please do not discuss on GitHub. Please report any suspected or confirmed security issues directly to https://github.com/notaryproject/tspclient-go/blob/main/CODEOWNERS. -->