added simple fastapi template

packages/create-llama/create-app.ts

packages/create-llama/index.ts

packages/create-llama/templates/index.ts

.../create-llama/templates/simple/fastapi/README-template.md

...ges/create-llama/templates/simple/fastapi/app/__init__.py

...create-llama/templates/simple/fastapi/app/api/__init__.py

...lama/templates/simple/fastapi/app/api/routers/__init__.py

...te-llama/templates/simple/fastapi/app/api/routers/chat.py

...s/create-llama/templates/simple/fastapi/data/brk-2022.pdf

packages/create-llama/templates/simple/fastapi/gitignore

packages/create-llama/templates/simple/fastapi/main.py

...ages/create-llama/templates/simple/fastapi/pyproject.toml

...s/create-llama/templates/simple/fastapi/tests/__init__.py

packages/create-llama/templates/types.ts