Added PR template

.github/pull_request_template.md

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+We welcome feedback and issue reporting for all bioBakery tools through our [Discourse site](https://forum.biobakery.org/c/pull-request/featurepull-request/). For users that would like to directly contribute to the [tools](https://github.com/biobakery/) we are happy to field PRs to address bug fixes. Please note the turn around time on our end might be a bit long to field these but that does not mean we don't value the contribution! We currently don't accept PRs to add new functionality to tools but we would be happy to receive your feedback on [Discourse](https://forum.biobakery.org/c/pull-request/featurepull-request/).
+
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Related Issue
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+
+## Screenshots (if appropriate):