Configure azure pipelines to run windows job

azure-pipelines.yml

@@ -1,42 +1,19 @@
 jobs:
-- job: macOS
-  pool:
-    vmImage: 'macOS 10.13'
-  timeoutInMinutes: 150
-  steps:
-  - task: NodeTool@0
-    inputs:
-      versionSpec: '8.12.0'
-  - script: |
-      sudo ulimit -n 65535
-      mvn -v
-      mvn clean install
-    displayName: 'Build Ballerina'
-- job: Linux
-  pool:
-    vmImage: 'Ubuntu 16.04'
-  timeoutInMinutes: 150
-  steps:
-  - task: NodeTool@0
-    inputs:
-      versionSpec: '8.12.0'
-  - script: |
-      sudo ulimit -n 65535
-      wget http://www-eu.apache.org/dist/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz
-      tar xzf apache-maven-3.5.4-bin.tar.gz
-      export PATH=$(pwd)/apache-maven-3.5.4/bin:$PATH
-      mvn -v
-      mvn clean install
-    displayName: 'Build Ballerina'
 - job: Windows
   pool:
     vmImage: 'VS2017-Win2016'
   timeoutInMinutes: 150
+  variables:
+    GRADLE_USER_HOME: $(Pipeline.Workspace)/.gradle
   steps:
   - task: NodeTool@0
     inputs:
       versionSpec: '8.12.0'
+  - task: CacheBeta@0
+    inputs:
+      key: gradle | $(Agent.OS)
+      path: $(GRADLE_USER_HOME)
+    displayName: Gradle build cache
   - script: |
-      mvn -v
-      mvn clean install
-    displayName: 'Build Ballerina'
+      ./gradlew build -Dorg.gradle.parallel=false -x :language-server:language-server-core:test -x :ballerina-packerina:test -x :ballerina-lang:test -x :ballerina-http:test -x :ballerina-file:test -x :ballerina-task:test -x :ballerina-socket:test -x :jballerina-unit-test:test -x :jballerina-integration-test:test -x :plugin-vscode:test -x createJavadoc --stacktrace -scan --console=plain --no-daemon
+    displayName: 'Ballerina Windows Build'