Set up project scaffolding: GitHub Actions workflows, issue templates, changelog, contributing guidelines, MIT license, and README

.github/workflows/codeql.yml

@@ -0,0 +1,35 @@
+# CodeQL: static security analysis (free for public repos).
+name: CodeQL
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+  schedule:
+    - cron: '0 6 * * 1'
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: java
+
+      - name: Build (for CodeQL)
+        run: |
+          chmod +x gradlew
+          ./gradlew compileJava --no-daemon
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3