[add] readme

Author: mkozhukh

readme.md

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+# Webix demo for NodeJS
+
+This package shows how Webix can be used with NodeJS (Express) backend.
+
+There are 3 major cases:
+
+- Loading data into data components (list, datatable, chart, etc. )
+- Loading data in hierarchical components (tree, treetable, etc.)
+- Working with forms
+
+For data loading the server must provide a GET handler which returns a collection of JSON objects (a single JSON object in case of the form )
+
+For data saving, a common REST pattern is used. Rest handlers must return a valid JSON object with optional ID value.
+
+### Check also
+
+
+- [PHP (Lumen | Laravel) samples](//github.com/webix-hub/webix-php-lumen-demo)
+- [.Net MVC samples](//github.com/webix-hub/webix-netmvc-demo)
+
+
+## License
+
+[MIT license](http://opensource.org/licenses/MIT)