Rename the template title to Java 12

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

containers/java-12/.devcontainer/Dockerfile

@@ -0,0 +1,23 @@
+#-----------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See LICENSE in the project root for license information.
+#-----------------------------------------------------------------------------------------
+
+FROM maven:3-jdk-12
+
+# Install git, process tools
+RUN yum update -y && yum install -y git procps unzip
+
+# Install Gradle
+ENV GRADLE_HOME /opt/gradle
+ENV GRADLE_VERSION 5.4
+ARG GRADLE_DOWNLOAD_SHA256=c8c17574245ecee9ed7fe4f6b593b696d1692d1adbfef425bef9b333e3a0e8de
+RUN curl -SL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
+    && echo "${GRADLE_DOWNLOAD_SHA256} *gradle.zip" | sha256sum --check - \
+    && unzip gradle.zip \
+    && rm gradle.zip \
+    && mv "gradle-${GRADLE_VERSION}" "${GRADLE_HOME}/" \
+    && ln -s "${GRADLE_HOME}/bin/gradlec" /usr/bin/gradle
+
+# Clean yum cache
+RUN yum clean all

containers/java-12/.devcontainer/devcontainer.json

@@ -0,0 +1,7 @@
+{
+	"name": "Java 12",
+	"dockerFile": "Dockerfile",
+	"extensions": [
+		"vscjava.vscode-java-pack"
+	]
+}

containers/java-12-maven/README.md → containers/java-12/README.md

@@ -1,14 +1,14 @@
-# Java 12 & Maven
+# Java 12
 
 ## Summary
 
-*Develop Java applications. Includes the JDK 12, XML tools, along with any dependencies Maven requires.*
+*Develop Java applications. Includes the JDK 12, Maven and Gradle build tools.*
 
 | Metadata | Value |  
 |----------|-------|
 | *Contributors* | The VS Code Java Team |
 | *Definition type* | Dockerfile |
-| *Languages, platforms* | Java, Maven |
+| *Languages, platforms* | Java, Maven, Gradle |
 
 ## Using this definition with an existing folder
 
@@ -25,11 +25,11 @@ Beyond that, just follow these steps to use the definition:
 2. To use VS Code's copy of this definition:
    1. Start VS Code and open your project folder.
    2. Press <kbd>F1</kbd> select and **Remote-Containers: Create Container Configuration File...** from the command palette.
-   3. Select the Java 12 & Maven definition.
+   3. Select the Java 12 definition.
 
 3. To use latest-and-greatest copy of this definition from the repository:
    1. Clone this repository.
-   2. Copy the contents of `containers/java-12-maven/.devcontainer` to the root of your project folder.
+   2. Copy the contents of `containers/java-12/.devcontainer` to the root of your project folder.
    3. Start VS Code and open your project folder.
 
 4. After following step 2 or 3, the contents of the `.devcontainer` folder in your project can be adapted to meet your needs.
@@ -43,9 +43,9 @@ This definition includes some test code that will help you verify it is working
 1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
 2. Clone this repository.
 3. Start VS Code, press <kbd>F1</kbd>, and select **Remote-Containers: Open Folder in Container...**
-4. Select the `containers/java-12-maven` folder.
+4. Select the `containers/java-12` folder.
 5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project.
-6. You should see "Hello Weekday" in the a Debug Console after the program executes.
+6. You should see "Hello Weekday" in the Debug Console after the program executes.
 7. From here, you can add breakpoints or edit the contents of the `test-project` folder to do further testing.
 
 ## License