custom trait

I'm making a custom civ, and want to give it a custom trait and ability for it's unit. The trait would be +1% science for each unique luxury resource. The ability would be to the knight, where it would gain additional attack power when near other knights. How would I go about doing either of these?

So I'm working on a Portugal mod and I want my Civilization trait to grant a free scout for every scout produced. The problem is I have no idea where to start. If anyone could help that'd be great. BTW my mod is in a SQL format, so I have a GameDefines.sql where the trait would be listed.

So I recently uploaded the Portuguese Civilization to the Steam Workshop. Regrettably it is still severely underdeveloped. By that I mean the traits are not unique and it doesn't have any units. Now, experienced modders will get a kick out of this: I have no clue how to add either. You may be...