add llama nextjs simple template

packages/create-llama/README.md

packages/create-llama/create-app.ts

packages/create-llama/helpers/examples.ts

packages/create-llama/index.ts

packages/create-llama/package.json

packages/create-llama/templates/index.ts

packages/create-llama/templates/simple/nextjs/.env.example

...s/create-llama/templates/simple/nextjs/README-template.md

...create-llama/templates/simple/nextjs/app/api/route/llm.ts

...ages/create-llama/templates/simple/nextjs/app/favicon.ico

...ages/create-llama/templates/simple/nextjs/app/globals.css

packages/create-llama/templates/simple/nextjs/app/layout.tsx

packages/create-llama/templates/simple/nextjs/app/page.tsx

packages/create-llama/templates/simple/nextjs/eslintrc.json

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

packages/create-llama/templates/simple/nextjs/next-env.d.ts

packages/create-llama/templates/simple/nextjs/next.config.js

...es/create-llama/templates/simple/nextjs/postcss.config.js

...ages/create-llama/templates/simple/nextjs/public/next.svg

...es/create-llama/templates/simple/nextjs/public/vercel.svg