fresh install invalid username and password

[joebordes]

have a look here: https://corebos.com/docs_grav/getting-started/develinstall

really short it is

- fork
- clone your fork `git clone`
- add upstream: `git remote add corebos https://github.com/tsolucio/corebos`
- install normally

from then on

- git pull corebos master
- load and apply corebos updater changes