Add README

README.md

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+# geoipapi
+
+This provides a small daemon intended to run within for example
+a kubernetes to provide MaxMind GeoIP data to other services over
+HTTP.
+
+The available APIs are `/api/country?ip=192.0.2.1` returning the
+country of the IP and `/api/json?ip=192.0.2.1` providing the maxmind
+data in JSON format.
+
+OpenTelemetry tracing is supported with the standard Traceparent http
+header, and configuration through the standard environment variables.
+(Work great with the opentelemetry collector operator).
+
+There's a small Go API client in `client/geoipapi`.