Added the contributing guide and code of conduct.
Added the contributing guide and code of conduct.

Craga89/Durandal,davismj/Durandal,davismj/Durandal,mryellow/Durandal,BlueSpire/Durandal,mryellow/Durandal,BlueSpire/Durandal,Craga89/Durandal,Craga89/Durandal,Craga89/Durandal,mryellow/Durandal,davismj/Durandal,BlueSpire/Durandal,mryellow/Durandal,davismj/Durandal,BlueSpire/Durandal