Add the Lua language

[ivaaane]

I like using Lua for coding, and it's a pretty relevant language nowadays, but I couldn't find it. I suggest adding an icon for Lua.

[Mirnalkishor]

I would be willing to work on this, can you assign this to me Thanks

[ivaaane]

@Mirnalkishor I don't think I have the permissions, or my page is broken