Add author name

README.md

@@ -55,6 +55,7 @@ The following authors, in alphabetical order, have contributed to Corryvreckan:
 
 * Matthew Daniel Buckland, University of Liverpool, @mbucklan
 * Manuel Colocci, CERN, @mcolocci
+* Chun Cheng, DESY, @chengc
 * Dominik Dannheim, CERN, @dannheim
 * Katharina Dort, University of Giessen/CERN, @kdort
 * Alexander Ferk, CERN, @aferk