docs: Update README

Author: akhy

README.md

@@ -2,6 +2,18 @@
 
 Unofficial client library to get data from Huawei router.
 
+This project provides 3 Go modules:
+
+- Cient library (root dir)
+- Prometheus exporter binary (`./exporter` dir)
+- CLI client binary (`./wei` dir)
+
+Also Docker image for the Prometheus exporter
+
+```sh
+docker pull ghcr.io/chickenzord/go-huawei-client:latest
+```
+
 ## Supported devices
 
 ### EG8145V5