update readme

doc/0.7.0.md

@@ -21,16 +21,18 @@ You can use an instance of Index directly (very much like the old FlexSearch whe
 
 ### Basic Usage
 
-Load the library via the ES6 module system:
+#### ES6 Modules:
 
 ```js
 import Index from "./index.js";
 import Document from "./document.js";
 
-var index = new Index(options);
-var document = new Document(options);
+const index = new Index(options);
+const document = new Document(options);
 ```
 
+#### Browser Bundle (ES5 Support):
+
 Or load one of the builds from the folder `dist` to your html as a script and use as follows:
 
 ```js
@@ -38,6 +40,20 @@ var index = new FlexSearch.Index(options);
 var document = new FlexSearch.Document(options);
 ```
 
+#### Node.js:
+
+Install the non-published beta version:
+
+```cmd
+npm install https://github.com/nextapps-de/flexsearch/tarball/0.7.0
+```
+
+Use as a npm module:
+
+```js
+const { Index, Document } = require("flexsearch");
+```
+
 The method signature stays almost unchanged:
 
 ```js