Update admin view so that people can be easily asigned to projects

## Need

```gherkin
In order to easily assign people to projects
As a ROSEdu team member
I want to have a nice admin view
```

## Deliverables

Admin view that allows easy project creation and assignment.

## Solution

- Use only django builtins

#### TODO

- [x] Use builtins to add more information in the admin page

## Notes
While looking for solutions to this found out that a set of features that Django Admin has are enough for what we need right now.