Create Organization model

Create a model named `Organization` in `orgs` app.
Fields: `name` (Single line text field), `description` (Multi-line text field).
It should have a many-to-one relationship with the `User` model (provided by django). Also register it on the admin site.

Start in the orgs app by inspecting existing model and admin patterns, then check how the Django User model is referenced elsewhere. Done means Organization has the requested fields and User relationship, appears in the admin site, and the project’s Django checks or tests pass.

Written by the indexing model from the issue text.