Pull request template

.github/templates/pull_request_template.md

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+Thank you for taking your time to contribute to Ersilia, just a few checks before we proceed
+- [ ] Have you followed the guidelines in our [Contribution Guide](https://github.com/ersilia-os/ersilia/blob/master/CONTRIBUTING.md)
+- [ ] Have you written new tests for your core changes, as applicable?
+- [ ] Have you successfully ran tests with your changes locally?
+
+**Description**
+
+_Replace this line with a short description here..._
+
+**Changes to be made**
+
+_Replace this line with how do you intend to go about getting this done..._
+
+**Status**
+
+_Replace this line with what you have done so far..._
+
+**To do**
+
+_If this is a work in progress, Replace this line with your next steps_
+
+Is this pull request related to any open issue? If yes, replace issueID below with the issue ID
+
+Related to #<issueID>