chore: add issue and PR templates (#47)

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+<!-- Please include a summary of the change and which issue is fixed. -->
+<!-- Please also include relevant motivation and context. -->
+
+Fixes # (issue)
+
+### Checklist
+
+- [ ] I have explained the need for this PR and the problem it solves
+- [ ] I have explained the changes or the new features added to this PR
+- [ ] I have added tests corresponding to this change
+- [ ] I have updated the documentation to reflect this change
+- [ ] I have verified that this change is backward compatible
+
+<!--
+
+Note:
+
+1. Mark the PR as draft until it's ready to be reviewed.
+2. Always add/update tests for any changes unless you have a good reason.
+3. Always update the documentation to reflect the changes made in the PR.
+4. Make a new commit to resolve conversations instead of `push -f`.
+5. To resolve merge conflicts, merge master instead of rebasing.
+6. Use "request review" to notify the reviewer after making changes.
+7. Only a reviewer can mark a conversation as resolved.
+
+-->

.github/workflows/ISSUE_TEMPLATE/bug_report.yaml

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+name: Bug Report
+description: File a bug report
+title: "Bug: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to report this bug!
+
+        _The more information you share, the faster we can identify and fix the bug._
+
+        Please check the [open issues](https://github.com/api7/adc/issues) to avoid duplication.
+  - type: textarea
+    id: current-behavior
+    attributes:
+      label: Current Behavior
+      description: Describe the issue with the current behavior.
+      placeholder: |
+        When I run `adc sync` I get an error message...
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Exxpected Behavior
+      description: Describe what you expected to happen instead.
+      placeholder: |
+        Instead of the error, I expect `adc sync` to...
+    validations:
+      required: false
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Share how we can reproduce this issue. Reports without proper steps are likely to be closed.
+      placeholder: |
+        1. Run `adc configure`
+        2. Run `adc sync` with this configuration file
+        3. Check APISIX if the configuration is applied
+        4. ...
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Share your environment details. Reports without proper environment details are likely to be closed.
+      value: |
+        - APISIX version:
+        - ADC version (run `adc version`):
+        - Operating system (run `uname -a`):
+    validations:
+      required: true

.github/workflows/ISSUE_TEMPLATE/feature_request.yaml

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+name: Feature Request
+description: Suggest a new feature
+title: "Feature: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to suggest a new feature.
+
+        _The more information you share, the faster we can help you._
+
+        Please check the [open issues](https://github.com/api7/adc/issues) to avoid duplication.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the feature you would like to see.
+      placeholder: |
+        As a user, I want to..., so that...
+    validations:
+      required: true

.github/workflows/ISSUE_TEMPLATE/improve_docs.yaml

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+name: Improve Documentation
+description: Suggest an improvement to the documentation
+title: "Docs: "
+labels: ["documentation"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to suggest an improvement to the documentation.
+
+        Please check the [open issues](https://github.com/api7/adc/issues) to avoid duplication.
+  - type: textarea
+    id: current-state
+    attributes:
+      label: Current State
+      description: Describe the current state of the documentation.
+      placeholder: |
+        The documentation for the command... is missing...
+    validations:
+      required: true
+  - type: textarea
+    id: desired-state
+    attributes:
+      label: Desired State
+      description: Describe the desired state of the documentation.
+      placeholder: |
+        The documentation should mention how to use the command... for...
+    validations:
+      required: true