Add initial CI integration

.github/workflows/tree-sitter.yml

@@ -0,0 +1,22 @@
+name: Tree Sitter CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Node.js
+      uses: actions/setup-node@v1
+    - name: Install Dependencies
+      run: npm install
+    - name: Check if generated file are up-to-date
+      run: npm run build --if-present && git diff --exit-code
+    - name: Run parser tests
+      run: npm test