Add CI workflow and GitHub issue/PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in SolDB
+labels: bug
+---
+
+**What happened?**
+
+
+**Expected behaviour?**
+
+
+**Steps to reproduce**
+
+
+**Environment**
+- SolDB version:
+- Python version:
+- OS:

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+
+## Testing done
+

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.11"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: pip install -e .
+      - name: Syntax check
+        run: python -m compileall src/