Added English Docs for README.md

README_en.md

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+# flutter_cpp_plugin
+
+#### Project Introduction:
+Use C++ to write nuter plug-in, support android and ios platforms。
+
+#### Instructions for use:
+
+Instruction in the pubspec.yaml file. 
+
+```
+flutter_cpp_plugin:
+    path: flutter_cpp_plugin Directory
+
+```
+
+Add your C++ code to plugins folder.
+
+
+#### Code Example:
+
+
+C++ Code:
+
+```C++
+
+class TestPlugin:public JsonPlugin
+{
+public:
+  TestPlugin()
+    :JsonPlugin("cppplugins.flutter.io/json_plugin")
+  {
+
+  }
+
+  virtual void HandleJsonMethodCall(const JsonMethodCall &method_call,
+        std::unique_ptr<MethodResult> result)
+  {
+    if(method_call.method_name() == "hello")
+    {
+      Json::Value value=method_call.GetArgumentsAsJson();
+      result->Success(&value);
+
+      //transfer dart
+      InvokeMethod("hello",value);
+    }
+  }
+};
+
+```
+
+dart Code:
+
+```dart
+
+MethodChannel jsonChannel = MethodChannel('cppplugins.flutter.io/json_plugin',JSONMethodCodec());
+
+jsonChannel.setMethodCallHandler((MethodCall call){
+    print("call from cpp plugin method ${call.method} arguments ${call.arguments}");
+});
+
+final String strResult = await jsonChannel.invokeMethod('hello','world');
+assert(strResult=="world");
+
+```