protein-protein tutorial added to the index

Author: rversin

education/HADDOCK3/index.md

@@ -49,6 +49,9 @@ _Note that HADDOCK3 is still in heavy development and as such the software is ev
 * [**Nanobody-antigen docking**](/education/HADDOCK3/HADDOCK3-nanobody-antigen):
   This tutorial is similar to the antibody-antigen docking tutorial, but it uses a nanobody instead of an antibody. In the tutorial we explain how to generate an ensemble of nanobody conformations in their unbound form and then how to dock it to the antigen using HADDOCK3.
 
+* [**Protein-Protein docking**](/education/HADDOCK3/HADDOCK3-protein-protein-basic):
+  This tutorial describes a basio protein-protein docking case using HADDOCK3. The interface information for the docking is derived from NMR chemical shift perturbation data. This tutorial requires basic Linux expertise.
+
 * [**Protein-Glycan modelling and docking**](/education/HADDOCK3/HADDOCK3-protein-glycan):
   This tutorial shows how to use HADDOCK3 to dock a glycan to a protein, provided that some information exists about the protein binding site.
   As HADDOCK3 only exists as a command line version, this tutorial does require some basic Linux expertise.