Allow setting targets on project level

[mos3abof]

Currently, the target is set on the whole account level, we need to be able to set targets for projects separately.

[mmagnus]

or clients. It would be lovely to have it. I have clients such as work, life, learning. It would be great if we could define them in the config file. I will look it up.

PS. Great tool! Thanks @mos3abof !

[yannick42]

PR #17 is a step toward this ;)