doc: add package description

Author: Kalle Ott

package.json

@@ -8,6 +8,7 @@
     "name": "Kalle Ott",
     "url": "https://github.com/kaoDev/"
   },
+  "description": "react-lazy-svg is a simple way to use SVGs with the performance benefits of a sprite-sheet and svg css styling possibilities. Without bloating the bundle. It automatically creates a sprite-sheet for all used SVGs on the client but also provides a function to create a server side rendered sprite-sheet for icons used in the first paint.",
   "version": "1.0.1",
   "main": "dist/index.js",
   "module": "dist/react-lazy-svg.esm.js",