build: github workflow

.github/workflows/pr_main.yml

@@ -0,0 +1,44 @@
+name: Rust Main Branch Pull Request -> Build & Test 
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build_linux:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build
+      run: cargo build --release --verbose
+    - name: Run tests
+      run: cargo test --verbose
+
+
+  build_windows:
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build
+      run: cargo build --release --verbose
+    - name: Run tests
+      run: cargo test --verbose
+
+
+  build_macos:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build
+      run: cargo build --release --verbose
+    - name: Run tests
+      run: cargo test --verbose