Add a way to budget time per project: tl budget <project> <time>

[fubarhouse]

It'd be useful to have a way to assign a monthly budget to a given project.
This would show up in the monthly billable report to show the number of hours available vs used, or something to similar effect.

Possible examples:

• tl budget <project> <time> --month
• tl budget <project> <time> --week

[larowlan]

Sounds good, would likely need a new table
May need to store project short codes (as seen in jira) instead of IDs (which are largely useless for human use)