* Added More applications of electron.
Whatsapp Desktop , Twitch.tv , Wire and Light Table are some popular apps among the many others developed by electron.
* Update index.md
Splitting the useful links into two sections (Boilerplates and Info References) and adding electron-userland and electron-react-boilerplate as two fairly useful repos any Electron developer might be interested. I'd encourage others to add Vue/Angular boilerplates.
Also added a couple tidbits of other info here and there