Create PULL_REQUEST_TEMPLATE

Author: wkh237

.github/PULL_REQUEST_TEMPLATE

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+Thank you for making a pull request ! Just a gentle remider :)
+
+1. If the PR is offering a feature please make the request to our "Feature Branch" 0.7.0
+2. Bug fix request to "Bug Fix Branch" 0.6.4
+3. Correct README.md can directly to master