Add issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐞 Bug Report
+description: Report a bug
+labels: 'type: bug'
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ## First of all
+        1. Please search for [existing issues](https://github.com/cinnyapp/cinny-desktop/issues?q=is%3Aissue) about this problem first.
+        2. Make sure Cinny is up to date.
+        3. Make sure it's an issue with Cinny and not something else you are using.
+        4. Remember to be friendly.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear description of what the bug is. Include screenshots if applicable.
+      placeholder: Bug description
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. Go to ...
+        2. Click on ...
+        3. See error
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: A clear description of what you expected to happen.
+
+  - type: textarea
+    id: info
+    attributes:
+      label: Platform and versions
+      description: "Provide OS, browser and Cinny version with your Homeserver."
+      placeholder: |
+       1. OS: [e.g. Windows 10, MacOS]
+       2. Cinny version: [e.g. 1.8.1]
+       3. Matrix homeserver: [e.g. matrix.org]
+       4. Downloaded from: [e.g. GitHub, Flatpak]
+      render: shell
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: 💬 Matrix Chat
+    url: https://matrix.to/#/#cinny:matrix.org
+    about: Ask questions and talk to other Cinny users and the maintainers

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 💡 Feature Request
+description: Suggest an idea
+labels: 'type: feature'
+
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the problem
+      description: A clear description of the problem this feature would solve
+      placeholder: "I'm always frustrated when..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: "Describe the solution you'd like"
+      description: A clear description of what change you would like
+      placeholder: "I would like to..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: "Any alternative solutions you've considered"
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.