Create DOCUMENTATION.yml (#127)

.github/ISSUE_TEMPLATE/DOCUMENTATION.yml

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+
+name: 📚 Documentation Issue
+description: Request additions or improvements to the documentation
+labels: "documentation"
+body:
+  - type: markdown
+    attributes:
+      value: |
+        > 🚨 If you have encountered a SECURITY RELATED ISSUE with Yii, [use this form](https://www.yiiframework.com/security) to report any security issues you have encountered to us. ***WARNING!*** DO NOT use the issue tracker or discuss it in the public forum as this will cause more harm than help.
+  - type: textarea
+    id: id-issue-category
+    attributes:
+      label: Issue Category
+      description: Choose the options that best describe your suggestion. **Delete what does not apply.**
+      value: |
+        - Typo or editorial suggestion (**Link to page:**)
+        - Incorrect/Outdated information (**Link to page:**)
+        - Missing page/section/topic (**Link to page:**)
+        - Can't find an answer to a specific question ✔️
+        - Organization/Navigation suggestion ✔️
+        - Other ✔️
+
+    validations:
+      required: true
+  - type: textarea
+    id: id-description
+    attributes:
+      label: Description
+      description: |
+        Describe what you expected to find. Also include relevant motivation and context.
+        If applicable, you can attach images by clicking this area to highlight it and then dragging files in.
+        :warning: _Remember to redact or remove any sensitive information!_
+      placeholder: Please put specific details about the typo, error, missing info, suggestion, etc here.
+    validations:
+      required: true