chore: set up some templates/forms for future contributors

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Report crashes or incorrect behaviour of existing functionality in QtNodes.
+type: Bug
+body:
+  - type: textarea
+    id: steps
+    attributes:
+      label: Description with steps to reproduce
+      description: Please also describe the actual (current) and expected behaviour and include a code snippet where relevant
+      placeholder: |
+        1. go to ...
+        2. then click on ...
+        3. then ...
+        Actual behaviour:
+        Expected behaviour:
+    validations:
+      required: true
+  - type: textarea
+    id: evidence
+    attributes:
+      label: Supporting files, videos and screenshots
+      description: |
+        * A short screen recording (ideally 20sec or less) or screenshot
+      placeholder: |
+        Click into this text box and paste your files, videos and screenshots here.
+    validations:
+      required: true
+  - type: input
+    id: qt_version
+    attributes:
+      label: Qt Version
+      description: What version of Qt does this bug occur on?
+      placeholder: Qt 5/6?
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      description: What OS does this bug occur on?
+      placeholder: Windows 11, macOS 13, Ubuntu 22.04, etc.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Further information which may be relevant to this bug
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: "Before submitting your bug report, please make sure the following requirements are met:"
+      options:
+        - label: "I have verified that this issue has not been logged before, by searching the [issue tracker](https://github.com/paceholder/nodeeditor/issues) for similar issues"
+          required: true
+        - label: "I have attached all requested files and information to this report"
+          required: true
+        - label: "I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible"
+          required: true
+  - type: markdown
+    attributes:
+      value: If an issue does not meet these requirements, it may be closed without investigation.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Request new functionality or enhancements.
+type: Feature
+body:
+  - type: textarea
+    id: idea
+    attributes:
+      label: Your idea
+      description: Describe your idea in a few sentences.
+    validations:
+      required: true
+  - type: textarea
+    id: whatfor
+    attributes:
+      label: Problem to be solved
+      description: What problem would your idea solve?
+    validations:
+      required: true
+  - type: textarea
+    id: other
+    attributes:
+      label: Prior art
+      description: Have you run into this problem with other apps? How did they solve it? You can paste screenshots.
+    validations:
+      required: false
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Anything else of note
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: "Before submitting your bug report, please make sure the following requirements are met:"
+      options:
+        - label: "I have verified that this feature request has not been logged before, by searching the [issue tracker](https://github.com/paceholder/nodeeditor/issues) for similar requests"
+          required: true
+  - type: markdown
+    attributes:
+      value: If a feature request does not meet these requirements, it may be closed without investigation.

.github/pull_request_template.md

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+## Type of change
+- [ ] Bug fix
+- [ ] New feature  
+- [ ] Breaking change
+- [ ] Documentation/refactoring
+
+## Description
+<!--
+Brief description of the change;
+If this is a breaking change, please describe what breaks and how to migrate
+-->
+
+## Testing
+- Qt version tested: 
+- [ ] Existing tests still pass
+- [ ] Added tests for new functionality (if applicable)
+
+## Breaking changes?
+<!-- If yes, describe what breaks and how to migrate -->
+
+## Related issue
+<!-- Link with "Fixes #123" or "Closes #123" if applicable -->
+
+---
+*Please fill out the sections above to help reviewers understand your changes.*