add compilation hints in the README

Author: tonimueller

README.md

@@ -3,6 +3,14 @@
 This software package calculates the Phantom modulus for the following systems: 
 - linear chains mixed with cross linkers 
 
+## Compilation 
+This project needs the [LeMonADE-library](https://github.com/LeMonADE-project/LeMonADE/) installed. The configure file helps to set the correct path and options. Execute in a shell 
+```shell 
+./configure -DLEMONADE_DIR=/path/to/installation/lemonade_install -DBUILDDIR=./build -DLEMONADE_TESTS=OFF/ON -DCMAKE_BUILD_TYPE=Release/Debug
+```
+This will run `cmake` and create the `build` directory. Now type in `make` which compiles the executables and runs the test if this option was given.
+
+
 ## Linear chains with cross linkers 
 The main [program](https://github.com/LeMonADE-project/LeMonADE_PhantomModulus/blob/master/projects/ForceEquilibrium.cpp) reads in a .bfm file and a data file. It is expected that the bfm file contains the following flags 
 ```