The project has started. The catalog is intended to contain information about all NES (Famicom) games. Over time the catalog will be extended with various functionality. Since it is a hobby project I will use the catalog to test interesting technologies and stuff in the future.
An NES emulator will eventually be integrated into the catalog project. This is an emulator that I have programmed myself using JavaScript. That project can be found in my nes-emulator repo on GitHub.