chore: adding docs

data/docs/go-tell-readme.md

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+<!-- go-doc:generated:begin source=go-tell:ui/app/README.md signature=4802e214d6466316d2951953a1d67e05 generated=2026-10-05 18:14 UTC -->
+Imported from ui/app/README.md in the go-tell repository.
+
+---
+
+# CMS frontend
+
+This Vite/React app lives in `ui/app` and is intentionally independent of the Go backend. Run
+`npm install`, then `npm run dev` or `npm run build`.
+
+There is no sign-in screen and no session is ever created. Content is public and read-only for
+anonymous visitors; the Edit button appears only when the backend reports `canEdit: true`, which
+happens when the upstream SSO proxy asserted the owner's identity on the request.
+`/api/auth/session` returns `{ "authenticated": bool, "canEdit": bool }`.
+
+Anonymous visitors also see a **Sign in with Google** button in the header. It redirects the
+browser to `VITE_SSO_LOGIN_URL` (with the current page passed as `rd`), where the identity
+provider authenticates you and sends you back with the identity header set. Leave
+`VITE_SSO_LOGIN_URL` empty to hide the button — useful when the proxy gates the whole app
+automatically instead. The app never performs an OAuth exchange, so it holds no client secret.
+
+The API defaults to same-origin `/api/auth/session` and `/api/content`. Set `VITE_API_BASE_URL`
+for a separate backend, or override the endpoint paths with `VITE_SESSION_ENDPOINT` and
+`VITE_CONTENT_ENDPOINT`. Requests use cookies (`credentials: include`) so the edge proxy cookie
+travels with them.
+<!-- go-doc:generated:end -->