Add GitHub actions workflow for building and testing

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: Cargo Build & Test
+
+on:
+  push:
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build_and_test:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: rustup update stable && rustup default stable
+      - run: cargo build --verbose
+      - run: cargo test --verbose