Create build_master.yml

This action will build the API code everytime a commit to master is made.

Author: CarlosMiguelAzevedoCampos

.github/workflows/build_master.yml

@@ -0,0 +1,19 @@
+name: "Build Master Branch"
+
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout  
+      uses: actions/checkout@v1
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+
+    - name: Build
+      run: dotnet build --configuration Release