added missing prism generate step to the Windows setup (updated read me)

[scewdoosh]

PR Fixes:

When setting up the project locally on Windows, running yarn prisma db seed fails with a PrismaClientInitializationError because the Prisma Client is not yet generated.

Adding an explicit yarn prisma generate step before running migrations resolves the issue.

Changes made:
Updated Windows setup instructions in README to include yarn prisma generate before yarn prisma migrate dev and yarn prisma db seed.

Why:

1. Prevents "stale Prisma Client" errors for new contributors.
2. Ensures a smoother onboarding experience when cloning the repo fresh.

Checklist before requesting a review

• I have performed a self-review of my code
• I assure there is no similar/duplicate pull request regarding same issue

README diff

-yarn prisma migrate dev
-yarn prisma db seed
+yarn prisma generate
+yarn prisma migrate dev
+yarn prisma db seed