Add pull request template

PULL_REQUEST_TEMPLATE.md

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+Thank you for your interest in this project managed by the Eclipse Foundation.
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+The guidelines for contributions can be found in the CONTRIBUTING.md file.
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+At a minimum, you must sign the Eclipse ECA, and sign off each commit.  
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+To complete and submit a ECA, log into the Eclipse projects forge 
+You will need to create an account with the Eclipse Foundation if you have not already done so.
+Be sure to use the same email address when you register for the account that you intend to use when you commit to Git.
+Go to https://accounts.eclipse.org/user/eca to sign the Eclipse ECA.
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+