Adding readme.md, Wikis and Releases

[filipe-maia]

This issue is just a suggestion, to preserve all information available in code.google.com/archive and to preserve all available compiled builds.

readme.md could be a copy of:
https://code.google.com/archive/p/popsloader

readme.md example:
New popsloader for PRO CFW
A new popsloader working on 6.xx PRO CFW
Project Information
The project was created on Jun 14, 2011.
License: GNU GPL v3
79 stars
hg-based source control
Labels:
procfw psp pops psx playstation

The wikis could be the same in:
https://code.google.com/archive/p/popsloader/wikis

Releases are available in:
https://code.google.com/archive/p/popsloader/downloads