Create CONTRIBUTING.md (#40)

Add contributing.md to provide baseline to allow contributions from community developers in lew of acceptable use policy.

Author: dbaldwin-splunk

CONTRIBUTING.md

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+CONTRIBUTING
+
+By submitting a Contribution to this Work, You agree that Your Contribution is made subject to the primary LICENSE 
+file applicable to this Work.  In addition, You represent that: (i) You are the copyright owner of the Contribution 
+or (ii) You have the requisite rights to make the Contribution.
+
+Definitions:
+
+“You” shall mean: (i) yourself if you are making a Contribution on your own behalf; or (ii) your company, 
+if you are making a Contribution on behalf of your company.  If you are making a Contribution on behalf of your 
+company, you represent that you have the requisite authority to do so.    
+ 
+"Contribution" shall mean any original work of authorship, including any modifications or additions to an existing 
+work, that is intentionally submitted by You for inclusion in, or documentation of, this project/repository.  For the 
+purposes of this definition, "submitted" means any form of electronic, verbal, or written communication submitted for 
+inclusion in this project/repository, including but not limited to communication on electronic mailing lists, source 
+code control systems, and issue tracking systems that are managed by, or on behalf of, the maintainers of 
+the project/repository. 
+
+“Work” shall mean the collective software, content, and documentation in this project/repository.