tooltip and prettier added

[namanbarkiya]

• Added a tooltip with the help of "react-tooltip" to make it more like the github contribution
• For the better code contribution added the prettier config file
• Added the CSS loader for the webpack

[namanbarkiya]

Major file changes are of prettier. It will be helpful in future contributions!

Hope it helps ^_^

[tomasvanagas]

I couldn't manage to make it work, could you explain how to use it?