Create PULL_REQUEST_TEMPLATE.md (#13)

Author: dschaper

.github/PULL_REQUEST_TEMPLATE.md

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+**By submitting this pull request, I confirm the following:** 
+*please fill any appropriate checkboxes, e.g: [X]*
+
+- [ ] I have read and understood the [contributors guide](https://github.com/pi-hole/pi-hole/blob/master/CONTRIBUTING.md), as well as this entire template.
+- [ ] I have made only one major change in my proposed changes.
+- [ ] I have commented my proposed changes within the code.
+- [ ] I have tested my proposed changes, and have included unit tests where possible.
+- [ ] I am willing to help maintain this change if there are issues with it later.
+- [ ] I give this submission freely and claim no ownership.
+- [ ] It is compatible with the [EUPL 1.2 license](https://opensource.org/licenses/EUPL-1.1)
+- [ ] I have squashed any insignificant commits. ([`git rebase`](http://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html))
+
+Please make sure you [Sign Off](https://github.com/pi-hole/pi-hole/wiki/How-to-signoff-your-commits.) all commits. Pi-hole enforces the [DCO](https://github.com/pi-hole/pi-hole/wiki/Contributing-to-the-project).
+
+---
+**What does this PR aim to accomplish?:**
+*A detailed description, screenshots (if necessary), as well as links to any relevant GitHub issues*
+
+
+**How does this PR accomplish the above?:**
+*A detailed description (such as a changelog) and screenshots (if necessary) of the implemented fix*
+
+
+**What documentation changes (if any) are needed to support this PR?:**
+*A detailed list of any necessary changes*
+
+
+---
+* You must follow the template instructions. Failure to do so will result in your pull request being closed.
+* Please respect that Pi-hole is developed by volunteers, who can only reply in their spare time.