Add CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on: [pull_request, push]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+    pango-test:
+      name: pango-test
+      runs-on: ${{ matrix.os }}
+
+      strategy:
+        matrix:
+          build:
+            - stable
+          include:
+            - build: stable
+              os: ubuntu-latest
+              rust: stable
+
+      steps:
+        - name: Checkout repository
+          uses: actions/checkout@v3
+
+        - name: Install rust toolchain
+          uses: dtolnay/rust-toolchain@v1
+          with:
+            toolchain: ${{ matrix.rust }}
+
+        - name: Basic build
+          run: cargo build --verbose
+
+    rustfmt:
+      name: rustfmt
+      runs-on: ubuntu-latest
+      steps:
+        - name: Checkout repository
+          uses: actions/checkout@v3
+
+        - name: Install rust toolchain
+          uses: dtolnay/rust-toolchain@stable
+          with:
+            components: rustfmt
+
+        - name: Check formatting
+          run: cargo fmt --all -- --check