Create pull_request_template.md (#229)

.github/pull_request_template.md

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+## Describe your changes
+
+## Issue ticket number and link
+
+## Checklist before requesting a review
+- [ ] I have read and understand the [Contributions section](https://github.com/tprouvot/Salesforce-Inspector-reloaded#contributions)
+- [ ] Target branch is releaseCandidate and not master
+- [ ] I have performed a self-review of my code
+- [ ] I ran the [unit tests](https://github.com/tprouvot/Salesforce-Inspector-reloaded#unit-tests) and my PR does not break any tests
+- [ ] I documented the changes I've made on the [CHANGES.md](https://github.com/tprouvot/Salesforce-Inspector-reloaded/blob/master/CHANGES.md) and followed actual conventions
+- [ ] I added a new section on [how-to.md](https://github.com/tprouvot/Salesforce-Inspector-reloaded/blob/master/docs/how-to.md) (optional) 
+