Add Japt README

mirai-japt/README.md

@@ -3,7 +3,47 @@
 
 Mirai Java Apt  
 
-提供一些阻塞/异步/RxJava API 来让 Java 调用 Mirai 的挂起函数 API 更容易  
-提供 Utils 类来让 Java 调用 Mirai 的内联方法更容易
+提供阻塞API 来让 Java 调用 Mirai 的 API 更容易
 
-该模块暂未完成.
+## 开始
+
+```java
+class Test{
+    public static void main(String[] args){
+        BlockingBot bot = BlockingBot.newInstance(123456, "");
+        
+        bot.login();
+        
+        bot.getFriendList().forEach(friend -> {
+            System.out.println(friend.getNick());
+        });
+        
+        Events.subscribeAlways(GroupMessage.class, (GroupMessage message) -> {
+            final BlockingQQ sender = BlockingContacts.createBlocking(message.getSender());
+        
+            sender.sendMessage("Hello");
+        });
+        
+        Thread.sleep(999999999);
+    }
+}
+```
+
+## 便捷开发
+
+在 IntelliJ IDEA 或 Android Studio 中找到设置 `Editor -> General -> Postfix Completion`, 添加一个设置到 `Java` 分类中:  
+![](.README_images/ce3034e3.png)  
+Applicable expression types:
+```
+net.mamoe.mirai.contact.Contact
+```
+转换后表达式:
+```
+net.mamoe.mirai.japt.BlockingContacts.createBlocking($EXPR$)
+```
+
+效果:
+
+![4SY8BC@J4ZKQM7OZ_~BC1I_1](.README_images/4SY8BC%40J4ZKQM%5D7OZ_~BC1I_1.png)
+
+![722WEHTTXD6XFFH43](.README_images/722W%28E%24HTTX%7BD6XFFH%5D%5D%2443.png)