Addition of functionality of custom response headers, request type, content type and status code.

[Sahil-Gulati]

Current scenario:
Content-Type → text/html; charset=utf-8

Returning JSON but getting Content-Type as text/html; charset=utf-8

Improved:
x-request-type → LaunchRequest /** Type of request. eg: LaunchRequest etc **/
Content-Type → application/json /** Can be changed. **/
x-dev-edition → flask-ask-devs /** Static header **/

Custom status code, request type, headers and content-type.

I hope this sounds meaningful to you. Few things are my requirements which can be a feature for your library. If you find it useful, please accept merge request. I want to further contribute in your implementation.

Thanks & Regards,
Sahil Gulati, SSE
Orange Business Services