README.md: more steps what to do after cloning
README.md: more steps what to do after cloning

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

aocampor/Diabetic,SingleMolecule/smb-plugins-maven,aocampor/Diabetic