Add minimal README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# jirorian
+
+Nostr-native image upload API for Cloudflare R2.
+
+Authenticates requests via [NIP-98](https://github.com/nostr-protocol/nips/blob/master/98.md), issues presigned R2 PUT URLs, and manages access via a custom Nostr registration event (kind `5392`). [NIP-96](https://github.com/nostr-protocol/nips/blob/master/96.md) compliant.
+
+## Requirements
+
+- Cloudflare R2 bucket with public CDN URL
+- A Nostr keypair for the service identity
+- A Nostr relay
+
+## Configuration
+
+All configuration is via environment variables:
+
+| Variable | Description |
+|---|---|
+| `R2_ENDPOINT` | `https://<account_id>.r2.cloudflarestorage.com` |
+| `R2_ACCESS_KEY_ID` | R2 access key |
+| `R2_SECRET_ACCESS_KEY` | R2 secret key |
+| `R2_BUCKET_NAME` | Target bucket |
+| `R2_CDN_URL` | Public CDN base URL |
+| `SERVICE_NOSTR_PRIVKEY` | Service Nostr private key (hex) |
+| `SERVICE_RELAY_URL` | Relay to subscribe to for registrations |
+| `JIRORIAN_DB` | SQLite DB path (default: `jirorian.db`) |
+
+## Development
+
+```bash
+nix develop   # enter dev shell with uv + virtualenv
+uv run fastapi dev jirorian/main.py
+```
+
+## Deployment
+
+Packaged as a Nix flake, consumed by the NixOS host configuration as a flake input.