feat: add github ci for tests, cargo check and clippy

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: Continuous Integration
+
+on: push
+
+env:
+    CARGO_TERM_COLOR: always
+
+jobs:
+    check:
+        runs-on: ubuntu-latest
+        name: Check
+        steps:
+            - uses: actions/checkout@v2
+            - name: cargo check
+              run: cargo check
+    test:
+        runs-on: ubuntu-latest
+        name: Test
+        steps:
+            - uses: actions/checkout@v2
+            - name: cargo test
+              run: cargo test
+    clippy:
+        runs-on: ubuntu-latest
+        name: Lint (clippy)
+        steps:
+            - uses: actions/checkout@v2
+            - name: cargo clippy
+              run: cargo clippy -- -D warnings