Doxygen README final

Author: Ithanil

doc/doxygen/README.md

@@ -4,10 +4,14 @@ Doxygen is documentation generator and is able to generate visualization of the
 
 ## Usage
 
-After installing doxygen, invoke the following on the command prompt (inside doxygen folder):
+First you need to install doxygen and the dot tool (graphviz), then invoke the following on the command prompt (inside doxygen folder):
 
+```bash
 doxygen doxygen.conf
+```
 
 Now you may view the created webpage by opening the doxygen.html symlink with a webbrowser of your choice, e.g.:
 
+```bash
 firefox doxygen.html
+```