add reddit clone

[aryaniyaps]

This PR adds a reddit clone API (which uses GraphQL).
The example can be run using docker compose.

Tech stack used:

• Strawberry GraphQL
• Starlette web framework
• Uvicorn ASGI server
• SQLAlchemy core/ mapper (asyncio)
• Alembic migrations
• PostgreSQL database server
• Marshmallow data validation
• Celery tasks (Redis store, RabbitMQ broker)

Features added:

• Implements the Relay spec
• data modelling with relations
• Error modelling within the schema
• Authorization with the permissions API
• Batch loading with dataloaders
• modular codebase

[simonsymhoven]

Hi @aryaniyaps,

thanks and great work! I tried to adapt your code but I run into some issues. Is it maybe possible, that you update this PR with latest dependencies of strawberry and the other ones? I think that could help! :)

all the best, Simon