Implement Funding Check for Investor Subscriptions

[mehalyna]

Technical Task: Implement Funding Check for Investor Subscriptions

Steps

1. Model Adjustments

   • Update the Subscription model (if needed) to include a Share field representing the investment share of an investor.
   • Add a method to the Project model to calculate the total funding.

2. Serializers

   • Create a serializer to handle subscription creation and funding checks.

3. Views

   • Create a view to handle subscription creation, including funding validation.

4. URLs

   • Define URLs to access the subscription endpoints.

5. Permissions

   • Ensure that only authenticated investors can create subscriptions.

6. Testing

   • Write unit tests to verify the subscription logic and ensure investors cannot subscribe to fully funded startups.

US #10