Update README.md

added documentation for rt-include

README.md

@@ -46,6 +46,7 @@ http://plugins.jetbrains.com/plugin/7648
     * [rt-class](#rt-class)
     * [rt-require](#rt-require)
     * [rt-template](#rt-template)
+    * [rt-include](#rt-include)
 * [styles](#styles)
 * [event handlers](#event-handlers)
 
@@ -269,6 +270,34 @@ define([
 });
 ```
 
+## rt-include
+Optionally choose to extract static contents out of rt files.<br>
+rt-include is a "macro" that takes a text file (e.g svg/html/xml) and injects it into the file as if it was part of the original markup.
+
+###### Sample:
+given `main.rt`: 
+```html
+<div>
+  <rt-include src="./my-icon.svg" />
+</div>
+```
+
+and `my-icon.svg`:
+```html
+<svg xmlns="http://www.w3.org/2000/svg">
+  <rect height="50" width="50" style="fill: #00f"/>
+</svg>
+```
+
+is equivalent to:
+```html
+<div>
+  <svg xmlns="http://www.w3.org/2000/svg">
+      <rect height="50" width="50" style="fill: #00f"/>
+  </svg>
+</div>
+```
+
 ## style
 React templates allow the settings of styles inline in HTML, optionally returning an object from the evaluation context. By default, style names will be converted from hyphen-style to camelCase-style naming.