Create pull_request_template.md (#81)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+**Important**
+
+_Please do not create a pull request unless you have created an appropriate issue, discussed the issue with the authors/maintainers and received the explicit approval of the library's authors/maintainers to provide a bug fix or feature implementation._
+
+_Creating pull requests without adequately discussing the situation with the authors/maintainers is likely to get your pull request closed._
+
+_This rule is in place to ensure that all issues are properly discussed, evaluated and agreed upon._