change readme file

README.md

@@ -10,13 +10,16 @@ newer version of this software at https://steffen.gulpe.de/modbus-tcpip/
 ![Image_02](https://steffen.gulpe.de/modbus-tcpip/screenshot-winver1-0-0-values.PNG)
 
 
-# Compilation
+# Compilation on Linux
+As requirement to compile this application you need to install the gnome3-devel packages. If this is done you can compile and run the application with the following commands:
+
 	make configlinux
 	make
+	./testmodbus-server
 
 
 # Installation
-not supported.
+not needed.
 
 
 # Cross Compilation for Windows (build on Debian, target Windows)