Create CONTRIBUTING.md
Create CONTRIBUTING.md

Makes a nice link in GitHub webpage UI to this file when a new issue is created.  Also prevents mavericks from messing with your guidelines (WiKi editing is open to all).

Reasoning: Want to add mention if code must be ES5.1 complaint, or what ES6 items you're OK with.
VladimirTechMan/LokiJS,techfort/LokiJS,runnr/LokiJS,runnr/LokiJS,Thrilleratplay/LokiJS,mcanthony/LokiJS,N8Sayer/Admin-control-panel,techfort/LokiJS,ThomasConner/LokiJS,Sarhing/LokiJS,victormacae/LokiJS,thrownblown/LokiJS,victormacae/LokiJS,Sarhing/LokiJS,casualuser/LokiJS,VladimirTechMan/LokiJS,casualuser/LokiJS,mcanthony/LokiJS,shivambarsaley/LokiJS,N8Sayer/Admin-control-panel,Thrilleratplay/LokiJS,shivambarsaley/LokiJS,axomic/LokiJS,ThomasConner/LokiJS,thrownblown/LokiJS,axomic/LokiJS