Add Angelscript to DB

Hi,
It would be great if AngelScript, the scripting library from https://angelcode.com/angelscript/, could be added to the DB. This is a very useful library, although I'm not entirely sure how adding it would work as its not on GitHub.

Start by reviewing the WrapDB project’s existing database entries and the AngelScript project at https://angelcode.com/angelscript/. Determine how a library hosted outside GitHub is represented and what metadata is required. Done means AngelScript has been added to the database in the project’s expected format.

Written by the indexing model from the issue text.