added links to some documentation

README.md

@@ -5,13 +5,13 @@ Various tools, examples, and documentation for communicating with Hoymiles micro
 
 In particular:
 
-* `doc/hoymiles-format-description.txt` is a detailed description of the communications format and the history of this project
-* `doc/getting-started-ESP8266.md` shows the hardware setup for an ESP8266-based system
+* `doc/hoymiles-format-description.txt` is a [detailed description of the communications format](doc/hoymiles-format-description.md) and the history of this project
+* `doc/getting-started-ESP8266.md` shows the [hardware setup for an ESP8266-based system](doc/getting-started-ESP8266.md)
 * The `tools` folder contains various software tools for RaspberryPi, Arduino and ESP8266/ESP32:
-  * A [version for ESP8266](tools/esp8266) that includes a web interface
-  * A [version for Arduino Nano](tools/nano/NRF24_SendRcv)
-  * An [alternative Version of the above](tools/NRF24_SendRcv)
-  * A [different implementation](tools/HoyDtuSim)
-  * An [implementation for Raspberry Pi](tools/rpi) that polls an inverter and archives results as log files/stdout as well as posting them to an MQTT broker.
+  * A [version for ESP8266](tools/esp8266/) that includes an web interface
+  * A [version for Arduino Nano](tools/nano/NRF24_SendRcv/)
+  * An [alternative Version of the above](tools/NRF24_SendRcv/)
+  * A [different implementation](tools/HoyDtuSim/)
+  * An [implementation for Raspberry Pi](tools/rpi/) that polls an inverter and archives results as log files/stdout as well as posting them to an MQTT broker.
 
 Contributors are always welcome!