Update README.md

Author: Wolfgang Maier

README.md

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 # mimodd-lib
 
-[MiModD](https://www.celegans.de/mimodd/) is a package for identifying genetic mutations in strains of model organisms through a technique called mapping-by-sequencing.
+[MiModD](https://www.celegans.de/mimodd/) is a package for identifying genetic mutations in strains of model organisms through a technique called [mapping-by-sequencing](http://mimodd.readthedocs.io/en/latest/nacreousmap.html).
 
 This is the development repository for the library component of the MiModD application.