Lightline support

[cultab]

Added lightline support.

By default the color setup is as similar to the screenshots as I could get.

If however a user adds the following to their config, the color setup is similar to what other lightline colorschemes do, eg: normal.left and normal.right match colors. let g:lightline#colorscheme#github_light#faithful = 0

On the left is the faithful version, on the right the more traditional version

[romgrk]

Cool :) A few questions:

• If the user colorscheme github-light, will it auto-adjust the lightline colorscheme? If not, is there a way to make it?
• Can you add documentation at the end of the readme on how to set it up for lightline users?

[cultab]

Cool :) A few questions:

• If the user colorscheme github-light, will it auto-adjust the lightline colorscheme? If not, is there a way to make it?

Maybe, I'll try to see what I can do but I think you're not supposed to set it for the user (based on other colorschemes I've used) but I also can't see why not.

• Can you add documentation at the end of the readme on how to set it up for lightline users?

Yes

[cultab]

I forgot to explain exactly what I did so:

I added some documentation and screenshots (obviously) but I could't get the lightline theme to work by just setting the colorscheme, it has to be done separately (I feel it's better this way).

[romgrk]

LGTM, thanks for the contribution :)