[DOC] Add mini installation guide

README.md

@@ -1,3 +1,17 @@
 # xtr-improved-frontend
 
-This is the improved frontend/webgui for xtr.
+This is the improved frontend/webgui for xtr.
+
+## Install / Build guide
+Install all needed node packages - `node_modules` folder will be created
+```
+$ npm install
+```
+To build final sources for production environment in `dist` folder
+```
+$ npm run build
+```
+Running app in development mode - accessible under http://localhost:8080/
+````
+$ npm run serve
+````