add doc

plugin-gradle/build.gradle

-plugins {
-    id 'java'
-    id 'org.jetbrains.intellij' version '0.4.10'
-}
-
-group 'com.duanledexianxianxian'
-version '1.0-SNAPSHOT'
-
-sourceCompatibility = 1.8
-
-repositories {
-    mavenCentral()
-}
-
-dependencies {
-    testCompile group: 'junit', name: 'junit', version: '4.12'
-}
-
-// See https://github.com/JetBrains/gradle-intellij-plugin/
-intellij {
-    version '2019.1'
-}
-patchPluginXml {
-    changeNotes """
-      Add change notes here.<br>
-      <em>most HTML tags may be used</em>"""
-}
\ No newline at end of file

plugin-gradle/src/main/java/com/duanledexianxianxian/plugin/idea/action/HelloAction.java

+package com.duanledexianxianxian.plugin.idea.action;
+
+import com.intellij.openapi.actionSystem.AnAction;
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.ui.Messages;
+
+/**
+ * @author Administrator
+ */
+public class HelloAction extends AnAction {
+    public HelloAction() {
+        super("Hello");
+    }
+
+    public void actionPerformed(AnActionEvent event) {
+        Project project = event.getProject();
+        Messages.showMessageDialog(project, "Hello world!", "Greeting", Messages.getInformationIcon());
+    }
+}

plugin-gradle/src/main/resources/META-INF/plugin.xml

 <idea-plugin>
     <id>com.duanledexianxianxian.plugin-gradle</id>
-    <name>Plugin display name here</name>
-    <vendor email="support@yourcompany.com" url="http://www.yourcompany.com">YourCompany</vendor>
+    <name>example</name>
+    <vendor email="fengyuchenglun@foxmail.com" url="https://github.com/fengyuchenglun">duanledexianxianxian</vendor>
 
     <description><![CDATA[
-    Enter short description for your plugin here.<br>
-    <em>most HTML tags may be used</em>
+    Create idea plguin by gradle Just fot test
     ]]></description>
 
     <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
@@ -20,5 +19,9 @@
 
     <actions>
         <!-- Add your actions here -->
+        <group id="MyPlugin.SampleMenu" text="Greeting" description="Greeting menu">
+            <add-to-group group-id="MainMenu" anchor="last"/>
+            <action id="Myplugin.Textboxes" class="com.duanledexianxianxian.plugin.idea.action.HelloAction" text="Hello" description="Says hello"/>
+        </group>
     </actions>
-</idea-plugin>
\ No newline at end of file
+</idea-plugin>