Create CONTRIBUTING.md

Author: doom369

CONTRIBUTING.md

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+## How to submit a bug report
+
+Please ensure to specify the following:
+
+* Blynk Server version (e.g. 0.28.0)
+* Contextual information (e.g. what you were trying to achieve)
+* Simplest possible steps to reproduce
+* Anything that might be relevant in your opinion, such as:
+  * JDK/JRE version or the output of `java -version`
+  * Operating system and the output of `uname -a`
+  * Network configuration
+
+
+### Example
+
+```
+Blynk Server version: 0.28.0
+
+Context:
+I encountered an exception which looks suspicious while running my Local Server.
+
+Steps to reproduce:
+1. ...
+2. ...
+3. ...
+4. ...
+
+$ java -version
+java version "1.8.0_51"
+Java(TM) SE Runtime Environment (build 1.8.0_51-b13)
+Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
+
+Operating system: Ubuntu Linux 14.04 64-bit