Add basic CI setup

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  check:
+    name: Check library
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
+        override: true
+    - name: Check library
+      run: cargo check
+
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
+        override: true
+    - name: Run tests
+      run: cargo test
+
+  fmt:
+    name: Run rustfmt
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
+        override: true
+        components: "rustfmt"
+    - name: Run rustfmt
+      run: cargo fmt -- --check