Add reverse engineer link

Author: awaescher

README.md

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 # MaxPower
 
-MaxPower is a prometheus exporter for SOLARMAX inverters. It is intended to query SOLARMAX inverter data using an reverse-engineered implementation of their proprietary MaxTalk protocol, called [MaxTalkSharp](/MaxTalkSharp).
+MaxPower is a prometheus exporter for SOLARMAX inverters. It is intended to query SOLARMAX inverter data using an [reverse-engineered](https://2007.blog.dest-unreach.be/2009/04/15/solarmax-maxtalk-protocol-reverse-engineered/) implementation of their proprietary MaxTalk protocol, called [MaxTalkSharp](/MaxTalkSharp).
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 ## Usage with Docker
 
 The easiest way to use MaxPower is with docker. Use the files from [the dashboard sample](usage-with-docker-compose) to run a MaxPower container along with Prometheus and Grafana for a local dashboard stack which runs perfectly fine on a Raspberry Pi.
 
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