Add CLAUDE.md with repo overview and T3 FAQ docs

CLAUDE.md

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+# create-t3-app — Codebase Guide
+
+## What this repo is
+
+This is the source for **create-t3-app** (v7.40.0), an interactive CLI that scaffolds full-stack, typesafe Next.js apps using the T3 Stack. It is **not** a framework — once you scaffold an app it's yours to own.
+
+**T3 Stack technologies:**
+- [Next.js](https://nextjs.org) — React framework
+- [tRPC](https://trpc.io) — end-to-end typesafe APIs
+- [Tailwind CSS](https://tailwindcss.com) — utility-first CSS
+- [TypeScript](https://typescriptlang.org) — typesafety
+- [Prisma](https://prisma.io) — ORM (PostgreSQL/MySQL/SQLite)
+- [Drizzle](https://orm.drizzle.team) — lightweight ORM alternative
+- [NextAuth.js](https://next-auth.js.org) — authentication
+
+## Monorepo structure
+
+```
+/
+├── cli/          # The create-t3-app CLI (published to npm as create-t3-app)
+│   ├── src/      # CLI source (TypeScript, built with tsup)
+│   └── template/ # Scaffold templates copied into new projects
+└── www/          # Documentation website (Astro)
+    └── src/pages/ # Docs in .md/.mdx, one folder per language
+```
+
+Package manager: **pnpm** (workspace). Build orchestration: **Turborepo**.
+
+## T3 Axioms
+
+1. **Solve Problems** — only add things that solve a specific problem. No state libs (zustand/redux), yes to NextAuth + Prisma/tRPC integration.
+2. **Bleed Responsibly** — use bleeding-edge tech only in low-risk parts. Stable DB (SQL), risky-but-cheap bets like tRPC.
+3. **Typesafety Isn't Optional** — typesafety is a first-class citizen. `.js` config files are typechecked via `checkJs` in tsconfig.
+
+## Common commands
+
+```bash
+# CLI
+cd cli
+pnpm build        # compile with tsup → dist/
+pnpm dev          # watch mode
+pnpm typecheck    # tsc
+pnpm lint         # eslint
+pnpm format       # prettier
+
+# www (docs site)
+cd www
+pnpm dev          # Astro dev server
+pnpm build        # production build
+```
+
+Node requirement: **>=18.17.0**
+
+---
+
+## T3 FAQ (from www/src/pages/en/faq.mdx)
+
+### What's next? How do I make an app with this?
+
+Keep the project as simple as possible — start with the scaffolding and add things as they become necessary. Refer to the individual technology docs or join the [Discord](https://t3.gg/discord) for help.
+
+Relevant docs: Next.js, NextAuth.js, Prisma, Tailwind CSS, tRPC, Drizzle.
+
+### How do I keep my app up to date?
+
+create-t3-app is a scaffolding tool, not a framework. Once you initialize an app it's yours — there is no postinstall updater. To track improvements, enable GitHub release notifications on the repo. Implementing every template change in your own app is not required.
+
+### What learning resources are currently available?
+
+The community recommends just diving in and learning while building. If you need structured resources:
+
+**Articles** (may be outdated):
+- [A first look at Create T3 App](https://dev.to/ajcwebdev/a-first-look-at-create-t3-app-1i8f)
+- [Migrating your T3 App into a Turborepo](https://www.jumr.dev/blog/t3-turbo)
+- [Integrating Stripe into your T3 App](https://blog.nickramkissoon.com/posts/integrate-stripe-t3)
+
+**Videos:**
+- [From 0 to Production - The Modern React Tutorial (RSCs, Next.js, Shadui, Drizzle, TS and more)](https://www.youtube.com/watch?v=d5x0JCZbAJs) *(recommended, updated 2024)*
+- [Jack Herrington - Build a Note Taking app with the T3 Stack](https://www.youtube.com/watch?v=J1gzN1SAhyM)
+- [Build a Twitter Clone with the T3 Stack](https://www.youtube.com/watch?v=nzJsYJPCc80)
+- [Build a Blog With the T3 Stack](https://www.youtube.com/watch?v=syEWlxVFUrY)
+- [Build a Live Chat Application with the T3 Stack](https://www.youtube.com/watch?v=dXRRY37MPuk)
+- [The T3 Stack - How We Built It](https://www.youtube.com/watch?v=H-FXwnEjSsI)
+- [An overview of the Create T3 App](https://www.youtube.com/watch?v=VJH8dsPtbeU)
+
+### Why are there `.js` files in the project?
+
+Per T3 Axiom #3, typesafety is mandatory. However, some frameworks/plugins don't support TypeScript, so certain config files must be `.js`. Each is explicitly typed as `cjs` or `mjs` based on what the consuming library supports. All `.js` files are still typechecked via `checkJs` in tsconfig.
+
+### I'm struggling to add i18n to my app. Is there any reference I can use?
+
+i18n is not included by default because it is opinionated and has many implementation approaches. A [reference repo](https://github.com/juliusmarminge/t3-i18n) exists showing how to add i18n using [next-i18next](https://github.com/i18next/next-i18next).
+
+### Should I use `/app` from Next.js 13 or the more mature `/pages` paradigm?
+
+Both are available when scaffolding. The `/app` directory is considered mature enough for production by the T3 community. If you prefer `/pages`, it remains supported — porting an existing router is a large effort so don't feel pressure to migrate unnecessarily.