Added diagrams to flamelet data generation documentation

Author: EvertBunschoten

Documentation/source/documentation/datageneration/flameletdatagen.rst

@@ -16,8 +16,21 @@ This page provides the documentation on the methods used for generating flamelet
 Process Diagram 
 ---------------
 
-# TODO: show solution diagram 
+.. figure:: fgm_data_generation.png
+   :scale: 75 %
+   :alt: 
 
+   Illustration of the process used to generate the data for the various flamelet types for a specific equivalence ratio or mixture fraction :math:`\phi_i`.
+
+
+.. figure:: fgm_data_output.png
+   :scale: 75 %
+   :alt: 
+
+   Illustration of data structures produced while generating flamelet data. The three folders for adiabatic and burner-stabilized flamelets and equilibrium data are generated under the main output directory specified in the configuration.
+
+
+      
 # TODO: describe steps 
 
 # TODO: describe which data are saved and how to retrieve dependent variables.