Update README.md Documentation

How to generate the code documentation with make and which framework is used

README.md

@@ -9,7 +9,7 @@ License|Linux & macOS Build
 
 <h2>Installation</h2>
 
-This is a Cmake project and can be run in any C++ IDE that is on the market. You have to define a certain set of parameters dependent on your system and what you wish to run in general.
+This is a Cmake project and can be run in any C++ IDE (Integrated Development Environment) that is on the market and supports CMake. You have to define a certain set of parameters dependent on your system and what you wish to run in general. The following will help you with the initial setup and links to the frameworks that can be linked in addition.
 
 <h3>Required Preinstallations</h3>
 Qt (for now)
@@ -77,7 +77,20 @@ This framework provides a set of unittests that uses the Google Test Framework a
 
 A general recommendation is CLION and Sublimetext. However, Visual Studio and others work fine as well.
 
+<h2>Documentation</h2>
+
+For the purpose of code documentation, the <a href="https://www.doxygen.nl">Doxygen</a> framework is used. It provides a simple and well formed way of code docuemtation for C++. Run 
+
+    make doc
+
+to compile and generate the repository's documentation. The `DoxyfileConfig.in` can be adapted and supports HTML (see `GENERATE_HTML`), LaTex (see `GENERATE_LATEX`), RTF (see `GENERATE_RTF`), MAN page (see `GENERATE_MAN`), XML (see `GENERATE_XML`), and DOCBOOK (see `GENERATE_DOCBOOK`) output of the documentation. Initially only html and latex is generated. The output directory is under`./documentation` and can be changed at `OUTPUT_DIRECTORY` if necessary.
+
 <h2>Summary</h2>
 
 This repository is based on the PhD thesis <a href="http://dx.doi.org/10.5445/IR/1000120612">"Combinatorial Problems in Energy Networks -- Graph Theoretic Models and Algorithms"</a>. The Git repository of the PhD thesis is available under <a href="https://github.com/franziska-wegner/PhD_Thesis--Combinatorial_Problems_in_Energy_Networks--Graph_Theoretic_Models_and_Algorithms">Combinatorial_Problems_in_Energy_Networks</a>. 
 
+<h2>Resources</h2>
+
+https://www.doxygen.nl
+https://github.com/franziska-wegner/PhD_Thesis--Combinatorial_Problems_in_Energy_Networks--Graph_Theoretic_Models_and_Algorithms
+http://dx.doi.org/10.5445/IR/1000120612