I would like to contribute to the Hard Disk I/O Monitor and Network Monitor plasmoids in Plasma 5, how can I get started?

Bump, does anyone know? I have decided I would like to contribute some code and fix some rendering bugs with these two favourite plasmoids of mine.

Honestly I don't know, but I'm sure your help would be appreciated. You might just need to get the attention of an active developer to help steer you in the right direction. You might try #plasma on FreeNode IRC.