Create build_pr.yml

.github/workflows/build_pr.yml

@@ -0,0 +1,21 @@
+name: Build PR
+
+on:
+    pull_request:
+        branches:
+            - master
+
+jobs:
+  test:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: | 
+          3.1.x
+          6.0.300
+    - name: Log dotnet info
+      run: dotnet --info
+    - name: Run test
+      run: ./build.ps1 --target=Test