Add question template for different topics

[coanor]

Is your feature request related to a problem? Please describe.
Our questions have multiple topics(such as web-side-usage/app-side-usage/agent-side-usage), each topic's default template are different, like github's issue page, while people select one topic, pop corresponding template for them to better write the answer, such as remember them to supply basic info and so on.

Describe the solution you'd like
Like github's issue page.

[surapuramakhil]

+1 it's a very good feature

@fenbox is there any voting sort of mechanism for prioritizing requests