Add branch representation and API calls

[sapk]

Needed for gogs/gogs#2410

The representation should be near Github API :
https://developer.github.com/v3/repos/#list-branches

[unknwon]

Thanks your PR... but Gogs does not provide this info at all currently... which means no use of this APIs.

[sapk]

The goal is to add it like https://github.com/gogits/gogs/blob/9cd16c5b12d093dd694e146d6c845ee4c405c774/routers/api/v1/user/keys.go.
Maybe I should do it in 2 step ?

• Add the representation (structure)
• Add api call after the api is implemented in gogs

[sapk]

I coudl also only return the name attribute for the API response and don't have to rely on API struc representation.

[unknwon]

This PR will remain open until server side is implemented :D

[unknwon]

The first letter of fields must be upper case.

[sapk]

Related wiki page (draft): https://gist.github.com/sapk/df64347ff218baf4a277
the url link is not implemented since there is no API for commit like https://developer.github.com/v3/repos/commits/

[bkcsoft]

@sapk is that really a POST to GET data?

EDIT: More specifically, the wiki-page-draft you linked says POST but the code says GET 😃

[sapk]

Sorry bad copy-paste in the draft ^^
Fixed.
@unknown already fix it in the official wiki : https://github.com/gogits/go-gogs-client/wiki/Repositories