Add CI via GitHub actions (#1)

Author: ucarion

.github/workflows/test.yml

@@ -0,0 +1,10 @@
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - run: cargo test