add readme

api/README.md

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+# DeFlock API
+
+A Fastify-based API service for DeFlock handling non-OSM related backend logic.
+
+## Endpoints
+- `/geocode?query=...` — Geocode a location
+- `/sponsors/github?username=...` — Get GitHub sponsors
+- `/healthcheck` — Health check
+
+## Development
+
+### Prerequisites
+- [Bun](https://bun.sh/) installed
+
+### Install dependencies
+```sh
+bun install
+```
+
+### Run locally
+```sh
+bun server.ts
+```
+
+## Deployment
+
+Deployed via GitHub Actions on push to `master`.
+
+## Environment Variables
+Create a `.env` file in this directory with:
+- `GITHUB_TOKEN` — Required for GitHub Sponsors endpoint