Separating out CLA and adding PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Proposed changes
+
+Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.
+
+## Types of changes
+
+What types of changes does your code introduce?
+_Put an `x` in the boxes that apply_
+
+- [ ] Bugfix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+
+## Checklist
+
+_Put an `x` in the boxes that apply._
+
+- [ ] I have read the [CONTRIBUTING](https://github.com/splunk/fluent-plugin-kubernetes-metrics/blob/develop/CONTRIBUTING.md) doc
+- [ ] I have read the [CLA](https://github.com/splunk/fluent-plugin-kubernetes-metrics/blob/develop/CLA.md)
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added necessary documentation (if appropriate)
+- [ ] Any dependent changes have been merged and published in downstream modules
+

CLA.md

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+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.