Add copyright notice to all files that use startbootstraps's code

[Exter-dg]

A lot of frontend code is used from startbootstrap-sb-admin-2.
This repository is available under the MIT License which requires us to add a copyright notice in all copies or substantial portions of the Software.

• Add the license information available at the top of every file which makes use of code from StartBootstrap (License)

For installation refer Readme.md

You can refer this link for more information.

[alainseys]

see my pr #10 where i have handled this @Exter-dg