Created a testing github workflow for testing extension on different OS's

Author: chrisdbeard

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: Tests Rust Doc String on Multiple OS
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  unit-tests:
+    name: Unit Tests on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run unit tests
+        run: npm test