Add CI

Author: andrewhickman

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust_version: [stable, "1.39.0"]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Setup Rust toolchain
+      run: rustup default ${{ matrix.rust_version }}
+    - name: Build
+      run: cargo build --all --verbose
+    - name: Run tests
+      run: cargo test --all --verbose
+    - name: Rustfmt and Clippy
+      run: |
+        cargo fmt -- --check
+        cargo clippy
+      if: matrix.rust_version == 'stable'