Upload Code (Valid Upload)

**As a** User
**I need** to bulk upload a zip file of student code 
**So that** I can grade the whole class at once without hassle
### Details and Assumptions
* [document what you know]
### Acceptance Criteria
```gherkin
Given I'm logged in as an instructor
When I upload a .py file for the "Project 1" assignment
Then the system should show a "Analysis in progress..." message
```
