Added README.md.

src/de/tud/kom/p2psim/impl/topology/views/fiveg/models/README.md

+# 5G Models
+
+This module allows to add models to each segment of the map. 
+
+## Models
+
+* Constant
+* Linear
+* Exponential
+* Logarithmic
+* Cut-Off
+
+### Constant
+
+```math
+f(x)=C
+```
+
+The constant model applies the the same constant value `c` to the selected metric.