create meta struct for better response

[k-avy]

The meta field should be free from json array so that we can pass arbitrary data in key-value form.

[asimrehman92]

Hi Gophers,
hope you are enjoying working with the code,
I would like to contribute to this PR. Could you please give me permission to start work on it?
cc: @avinal @dvjsharma @GMishx

[nick2432]

can i work on this?