Added windows job

Author: Vitaliy Boyko

.github/workflows/gradle.yml

@@ -26,3 +26,20 @@ jobs:
       run: chmod +x gradlew
     - name: Run automated tests
       run: ./gradlew test -i
+
+  build-windows:
+
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Gradle wrapper
+        run: gradle wrapper
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Run automated tests
+        run: ./gradlew test -i