Update readme.md

examples/USER/pinning/readme.md

-This package contains a bias potential that can be used to study solid-liquid transitions with the interface pinning method.
-This is done by adding a harmonic potential to the Hamiltonian that bias the system towards two-phase configurations. 
+This example demonstrate using a bias potential that can be used to study solid-liquid transitions with the interface pinning method. This is done by adding a harmonic potential to the Hamiltonian that bias the system towards two-phase configurations. 
 
   U_bias = 0.5*k*(Q-a)^2
 
@@ -13,10 +12,6 @@ Please visit
   urp.dk/interface_pinning.htm 
 for a detailed bibliography. 
 
-# Build
-Remember to include the following command when building LAMMPS
-  make yes-user-pinning
-
 # Use
 
    fix [name] [groupID] rhok [nx] [ny] [nz] [spring-constant] [anchor-point]
@@ -52,7 +47,3 @@ That method have been experienced to be most effective in the slightly super-hea
   Ulf R. Pedersen
   http://www.urp.dk
   ulf AT urp.dk
-
-# Cite
-Please cite 
-  [Ulf R. Pedersen, J. Chem. Phys. 139, 104102 (2013)]