Add some GitHub issue templates.

.github/ISSUE_TEMPLATE/bug.yml

@@ -0,0 +1,54 @@
+name: Bug Report
+description: Report a bug
+labels: [bug]
+
+body:
+- type: textarea
+  id: problem
+  attributes:
+    label: What is the problem?
+  validations:
+    required: true
+
+- type: textarea
+  id: reproduction
+  attributes:
+    label: Reproduction Steps
+    description: (If known) Minimal steps that can reproduce the issue.
+  validations:
+    required: false
+
+- type: input
+  id: version
+  attributes:
+    label: tt-rss Version
+    description: Which version (commit) of tt-rss are you using?
+  validations:
+    required: true
+
+- type: textarea
+  id: environment
+  attributes:
+    label: Environment
+    description: |
+      How are you running tt-rss?  Include all relevant details (e.g. Docker image, OS, PHP version, etc.).
+  validations:
+    required: true
+
+- type: textarea
+  id: other
+  attributes:
+    label: Other Information
+    description: |
+      Anything else you want to provide (e.g. related issues, suggestions on how to fix, links for context, etc.).
+  validations:
+    required: false
+
+- type: checkboxes
+  id: acknowledgments
+  attributes:
+    label: Acknowledge
+    description: Please mark any checkbox that applies (otherwise leave unchecked).
+    options:
+      - label: I'm interested in implementing the fix
+        required: false

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation Issue
+description: Report an issue with documentation
+labels: [documentation]
+
+body:
+- type: textarea
+  id: issue
+  attributes:
+    label: What is the issue?
+  validations:
+    required: true
+
+- type: checkboxes
+  id: acknowledgments
+  attributes:
+    label: Acknowledge
+    description: Please mark any checkbox that apply (otherwise leave unchecked).
+    options:
+    - label: I'm interested in implementing the fix
+      required: false

.github/ISSUE_TEMPLATE/enhancement.yml

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+name: Enhancement Request
+description: Request a new enhancement/feature
+labels: [enhancement]
+
+body:
+- type: textarea
+  id: description
+  attributes:
+    label: Description
+    description: Short description of the enhancement/feature you are proposing.
+  validations:
+    required: true
+
+- type: textarea
+  id: use-case
+  attributes:
+    label: Use Case
+    description: Why do you need this feature?
+  validations:
+    required: true
+
+- type: textarea
+  id: solution
+  attributes:
+    label: Proposed Solution
+    description: |
+      (If known) How would you propose the enhancement/feature be implemented?
+  validations:
+    required: false
+
+- type: input
+  id: version
+  attributes:
+    label: tt-rss Version
+    description: Which version (commit) of tt-rss are you currently using?
+  validations:
+    required: true
+
+- type: textarea
+  id: other
+  attributes:
+    label: Other Information
+    description: |
+      Anything else you want to provide (e.g. related issues, suggestions on how to implement, links for context, etc.).
+  validations:
+    required: false
+
+- type: checkboxes
+  id: acknowledgments
+  attributes:
+    label: Acknowledge
+    description: Please mark any checkbox that apply (otherwise leave unchecked).
+    options:
+    - label: I'm interested in implementing the feature
+      required: false
+    - label: This feature might result in a breaking change
+      required: false