Added contributing.md

CONTRIBUTING.md

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+## PLEASE READ: 
+
+### Reporting Bugs:
+
+If you are reporting a new issue, you will make our life much simpler (and the fix come much sooner):
+
+#### Specify the Platform 
+ 
+Godot runs on a large variety of platforms and operating systems and devices. If you believe your issue is device/platform dependent, please specify:
+* Operating System
+* Device
+* GPU Model
+
+#### Specify Reproduction Steps
+
+Many bugs can't be reproduced unless specific steps are taken. Please **specify the exact steps** that must be taken to reproduce the condition.
+
+#### Provide a Simple,  Example Project
+
+Sometimes an unexpected behavior happens in your project. In such case understand that we can't always take a look at your project. Providing **a simple project** that isolates and reproduces the issue is always the **the best way for us to fix it**.
+
+### Contributing Pull Requests
+
+If you are adding new engine funcitonality, please make sure that:
+
+* This functionality is desired.
+* You talked to other developers on how to implement it best.
+* Even if it won't be merged, your PR is useful for future work on another developer.
+
+Thanks!
+
+The Godot Development Team