Add github workflow CI (#74)

* Create rust.yml

* Add build badge to README

* Fix readme badge link

.github/workflows/rust.yml

@@ -0,0 +1,19 @@
+name: Rust
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose