docs: write a readme

README.md

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+# admin-panel
+
+The internal admin panel for weeb.vip — the screens for managing anime content,
+rather than the public site.
+
+React 18 and TypeScript on Vite, talking to the same GraphQL API the front end
+uses, with types generated from the schema.
+
+## Running it
+
+Requires the Node version in `.nvmrc` and Yarn 4 (Berry — the repo carries its
+own `.yarnrc.yml`, so no global install is needed beyond corepack).
+
+```sh
+yarn install
+yarn dev        # dev server on :8081
+yarn build      # type-check and build
+yarn preview    # serve the build locally
+```
+
+## GraphQL
+
+Queries live in `operation.graphql` and the schema in `schema.graphql`;
+`codegen.ts` turns them into typed documents:
+
+```sh
+yarn graphql-codegen
+```
+
+Generated output is committed, so regenerate and commit it alongside any schema
+change.
+
+## How it is put together
+
+- **Styling** — Tailwind, with SCSS where a component needs more than utilities.
+- **State** — Zustand for global state, TanStack Query for anything from the
+  server.
+- **Routing** — React Router v6.
+- **Feature flags** — Flagsmith.
+- **Components** — one directory each under `src/components`, with an
+  `index.ts` re-export, so imports do not reach into a component's internals.
+
+## Deployment
+
+Built to static files and served by nginx — see `Dockerfile` and `nginx.conf`.
+`src/_redirects` keeps client-side routing working on hosts that read it.