enable CI

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  merge_group:
+
+jobs:
+  ci:
+    name: Continuous Integration
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      - name: Install ${{ matrix.rust }} toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: clippy, rustfmt
+
+      - name: Run tests
+        run: cargo t
+
+      - name: Check that code is formatted
+        run: cargo fmt -- --check
+
+      - name: Lint code
+        run: cargo clippy -- -D warnings