Add gradle extension into pack (#1374)

Author: jdneo

README.md

@@ -18,6 +18,10 @@ By installing Extension Pack for Java, the following extensions are installed:
 - [📦 Maven for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-maven)
     - Project Scaffolding
     - Custom Goals
+- [📦 Gradle for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-gradle)
+    - View Gradle tasks and project dependencies
+    - Gradle file authoring
+    - Import Gradle projects via [Gradle Build Server](https://github.com/microsoft/build-server-for-gradle)
 - [📦 Project Manager for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-dependency)
     - Manage Java projects, referenced libraries, resource files, packages, classes, and class members
 - [📦 Visual Studio IntelliCode](https://marketplace.visualstudio.com/items?itemName=VisualStudioExptTeam.vscodeintellicode)

package.json

@@ -375,6 +375,7 @@
     "vscjava.vscode-java-debug",
     "vscjava.vscode-java-test",
     "vscjava.vscode-maven",
+    "vscjava.vscode-gradle",
     "vscjava.vscode-java-dependency",
     "VisualStudioExptTeam.vscodeintellicode"
   ],