Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+- [ ] I have read and agree to the [Contribution Guidelines](https://github.com/FreeTubeApp/FreeTube/blob/master/CONTRIBUTING.md)
+- [ ] I can maintain / support my code if issues arise.
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+**Does your change relate to a current issue? Please list it here if applicable.**
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+**Please list out the changes you've made**
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+**Does your change include any new Node Modules?  If yes, what modules and what are they licensed under?**
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+**Other Comments**