Added a contributing section to the readme.
Added a contributing section to the readme.

Vinagility/engine_old,benhutton/engine_bak,bewculture/engine,StartupWeekend/engine,timsly/engine,slavajacobson/engine,boie0025/engine,LaunchPadLab/engine,boie0025/engine,Sharagoz/engine,merqlove/engine,local-ch/locomotivecms-engine,chepri/engine,timsly/engine,ipmobiletech/locomotivecms-engine,merqlove/engine,LaunchPadLab/engine,Sharagoz/engine,thirus/engine,Coren/engine,local-ch/locomotivecms-engine,k-yamada/engine,furkanayhan/engine,masm/engine,boie0025/engine-clone,emanuel/engine,gdsn13/lococodevie,scarl3tt/engine,ipmobiletech/locomotivecms-engine,StartupWeekend/engine,k-yamada/engine,gdsn13/locridevie,ipmobiletech/locomotivecms-engine,Vinagility/engine_old,slavajacobson/engine,Coren/engine,gdsn13/lococodevie,chepri/engine,merqlove/engine,scarl3tt/engine,chepri/engine,gdsn13/lococodevie,gdsn13/locridevie,bewculture/engine,boie0025/engine,merqlove/engine,dreimannzelt/locomotive-engine,dreimannzelt/locomotive-engine,gdsn13/lococodevie,local-ch/locomotivecms-engine,gdsn13/locridevie,emanuel/engine,dreimannzelt/locomotive-engine,timsly/engine,Sharagoz/engine,boie0025/engine-clone,StartupWeekend/engine,masm/engine,slavajacobson/engine,Vinagility/engine_old,StartupWeekend/engine,bewculture/engine,boie0025/engine-clone,k-yamada/engine,masm/engine,benhutton/engine_bak,local-ch/locomotivecms-engine,Coren/engine,gdsn13/locridevie,thirus/engine,gdsn13/locridevie,benhutton/engine_bak,thirus/engine,timsly/engine,dreimannzelt/locomotive-engine,LaunchPadLab/engine,bewculture/engine,scarl3tt/engine,furkanayhan/engine,thirus/engine,furkanayhan/engine,chepri/engine,k-yamada/engine,LaunchPadLab/engine,Gnuside/contrib-locomotivecms-engine,bewculture/engine,masm/engine,furkanayhan/engine,Gnuside/contrib-locomotivecms-engine,scarl3tt/engine,Coren/engine,boie0025/engine,boie0025/engine-clone,ipmobiletech/locomotivecms-engine,Gnuside/contrib-locomotivecms-engine,slavajacobson/engine,emanuel/engine