Add back our .github integrations

Change-Id: I52fe6f0ea44a5b2ee196918c291cbed45c569cfc

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve SchildiChat
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. Samsung S6]
+ - OS: [e.g. Android 6.0]
+
+**Additional context**
+ - App version: [Look it up in Settings / Help & About. Click "Version" there to copy it. "Latest version" is not a valid version!]
+ - Store: [e.g. F-Droid, Google Play, SpiritCroc's F-Droid]
+ - Homeserver: [e.g. matrix.org]
+ - Related experimental/labs settings: [Have you enabled any experimental or labs settings (which ones), and does the issue still exist when disabling these?]
+ - Logs have been submitted using the app's built-in bug report (/"rageshake") mechanism: [yes/no]
+
+**Upstream relevance**
+ - Does this issue exist in Element X Android?
+ - If this issue exists in Element X Android, please also link the corresponding bug report (create a new one if it doesn't exist yet)
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: type:suggestion
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/stale.yml

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+name: 'Close stale issues'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v6
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 150 days with no activity. Remove stale label or comment or this will be closed in 14 days.'
+          days-before-issue-stale: 150
+          days-before-issue-close: 14
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          exempt-issue-labels: 'longterm,enhancement,prio:medium,prio:high'