Add SETUP.md: short Docker self-host + Hugging Face/Neon deploy guide

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

SETUP.md

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+# Setup — Deploy with Docker (self-host)
+
+Very short guide. Runs the browser + all 3 API servers on your own machine/server.
+**Your login is saved automatically — no database needed for Docker.**
+
+## 1. Install Docker
+- [Docker Desktop](https://www.docker.com/products/docker-desktop/) (Mac/Windows) or `docker` + `docker compose` (Linux).
+- Check: `docker --version`
+
+## 2. Get the code
+```bash
+git clone https://huggingface.co/spaces/akash1313/selfapi
+cd selfapi
+```
+
+## 3. Run it
+```bash
+docker compose up --build -d
+```
+- Open **http://localhost:3001** → watch the browser.
+- **Log in** to ChatGPT / Gemini / Flow once.
+
+## 4. Stop / restart
+```bash
+docker compose down      # stops; login stays saved in the volume
+docker compose up -d      # starts again; login is back
+```
+Your profile lives in the `chrome-profile` Docker volume, so logins survive
+restarts and reboots automatically. (To wipe it: `docker compose down -v`.)
+
+---
+
+## Which file does what
+| File | Job |
+|------|-----|
+| `docker-compose.yml` | Runs everything (browser + 3 servers) + the save-login volume |
+| `Dockerfile` | Builds the browser image |
+| `start_hf.sh` | Boot steps (start Chrome + extensions) |
+
+---
+
+## Running on Hugging Face instead? (needs Neon)
+
+HF free Spaces have **no permanent disk**, so there logins need a Postgres database.
+
+1. Sign up free at **[neon.tech](https://neon.tech)** → create a project.
+2. Copy the **connection string**
+   (`postgresql://user:pass@...neon.tech/db?sslmode=require`).
+3. In your Space → **Settings → Variables and secrets → New secret**:
+   - Name: `DATABASE_URL`
+   - Value: the connection string
+4. The Space restarts → **log in once** → it auto-saves every 5 min and survives rebuilds.
+
+> Deploy code to HF with `git push`. Never commit the connection string.