Add README

README.md

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+# crimata-dns
+
+Small internal API for provisioning DNS on `crimata.com` via Cloudflare — used to give each new Crimata customer a free subdomain, and optionally point a custom domain at their instance.
+
+## What it does
+
+- `GET /domains/check?domain=` — check domain availability
+- `POST /domains` — create a subdomain for a customer, and optionally register + point a custom domain
+- `DELETE /domains/:recordId` — remove a DNS record
+
+Built with [Fastify](https://fastify.dev/) + TypeScript, talking to the Cloudflare API.
+
+## Running it
+
+```
+cp .env.example .env   # fill in Cloudflare API token, account ID, zone ID
+npm install
+npm run dev
+```
+
+The included `Dockerfile` builds and runs the compiled version (`npm run build` then `node dist/index.js`).