project_workload: start build a module for managing project workload per week

[codecov[bot]]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (2fb9ea3) 80.01% compared to head (cc829bd) 81.66%.

:exclamation: Current head cc829bd differs from pull request most recent head 6dfc57b. Consider uploading reports for the commit 6dfc57b to get more accurate results

Files	Patch %	Lines
project_workload/models/project_task.py	42.30%	15 Missing :warning:
project_workload/models/project_user_capacity.py	90.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 14.0 #278 +/- ## ========================================== + Coverage 80.01% 81.66% +1.65% ========================================== Files 123 127 +4 Lines 1356 1462 +106 Branches 260 274 +14 ========================================== + Hits 1085 1194 +109 + Misses 232 229 -3 Partials 39 39 ```

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