Add issue and PR templates to streamline contribution

Author: Alexwijn

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+about: Create a report to help us improve the integration.
+title: "[BUG]"
+labels:
+  - bug
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to file an issue! Please fill out the form below so we can investigate and fix your problem.
+  - type: input
+    id: summary
+    attributes:
+      label: Summary of the bug
+      description: A short, descriptive title for the issue
+      placeholder: e.g., "OpenTherm gateway disconnects after restart"
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Detailed steps that lead to the bug.
+      placeholder: |
+        1. Open Home Assistant
+        2. ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected_behavior
+    attributes:
+      label: Expected behavior
+      description: What you expected to happen.
+    validations:
+      required: false
+  - type: textarea
+    id: actual_behavior
+    attributes:
+      label: Actual behavior
+      description: What actually happened.
+    validations:
+      required: true
+  - type: input
+    id: homeassistant_version
+    attributes:
+      label: Home Assistant version
+      description: The version of Home Assistant you are using.
+      placeholder: e.g., 2024.1.0
+    validations:
+      required: true
+  - type: input
+    id: integration_version
+    attributes:
+      label: Integration version
+      description: The commit or tag of the SAT integration.
+      placeholder: e.g., v1.2.3 or HEAD
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant logs
+      description: Paste any relevant log snippets (e.g., from config entries). Use triple backticks.
+      render: shell
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+about: Suggest a new feature or improvement.
+title: "[FEATURE]"
+labels:
+  - enhancement
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping us improve SAT! Please describe the feature you’d like to see.
+  - type: input
+    id: summary
+    attributes:
+      label: Feature Summary
+      description: One‑sentence description of the requested feature.
+      placeholder: e.g., "Add support for XYZ boiler model"
+    validations:
+      required: true
+  - type: textarea
+    id: rationale
+    attributes:
+      label: Rationale
+      description: Why is this feature valuable? Who will benefit?
+    validations:
+      required: false
+  - type: textarea
+    id: implementation_ideas
+    attributes:
+      label: Implementation Ideas
+      description: Any thoughts on how to implement it or potential challenges.
+    validations:
+      required: false
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+  This file is used as the default template for pull requests.
+  It provides a checklist that ensures new contributions follow project conventions.
+-->
+
+# Pull Request Template
+
+## Summary
+- [ ] I have added a clear, concise title and description.
+- [ ] The description includes what has changed and why it matters.
+
+## Checklist
+- [ ] I followed the coding style guidelines (PEP8, Home Assistant patterns).
+- [ ] All new code is typed with type hints where appropriate.
+- [ ] I added or updated unit tests that cover my changes.
+- [ ] Tests run locally and on CI without errors.
+- [ ] Documentation updates (README, docs, comments) are included if relevant.
+
+## Screenshots / Visuals
+(Add screenshots if the PR introduces UI changes.)
+
+## Additional Notes
+(Any extra information for reviewers.)
+