Update README.md (ONLYOFFICE#24)

Author: kseniafedoruk

sdkjs-plugins/README.md

@@ -1 +1,29 @@
-# sdkjs-plugins
+# sdkjs-plugins
+
+This repository comprises plugin styles for [ONLYOFFICE plugins](https://api.onlyoffice.com/plugin/basic).
+
+## Description
+
+ONLYOFFICE provides a style sheet for different interface elements. To adjust your plugin interface to the ONLYOFFICE style, connect the [plugin.css](https://onlyoffice.github.io/sdkjs-plugins/v1/plugins.css) to the [index.html](https://api.onlyoffice.com/plugin/indexhtml) file with the following link:
+
+`<link rel="stylesheet" href="https://onlyoffice.github.io/sdkjs-plugins/v1/plugins.css">`
+
+Plugin styles (controls) include:
+
+* Different types of buttons
+* Input controls (text area, text field, checkbox)
+* Label controls (header label, link label)
+* Combo box
+* Loader
+
+For more details and examples, please refer to the [ONLYOFFICE API documentation](https://api.onlyoffice.com/plugin/styles).
+
+## Project information
+
+Official website: [www.onlyoffice.com](https://www.onlyoffice.com/)
+
+Repository: [github.com/ONLYOFFICE/onlyoffice.github.io](https://github.com/ONLYOFFICE/onlyoffice.github.io) 
+
+## User feedback and support
+
+In case you have any issues, questions or suggestions, please visit our official forum:  [forum.onlyoffice.com](https://forum.onlyoffice.com/), or leave your feedback [here](https://github.com/ONLYOFFICE/onlyoffice.github.io/issues).