Create pull_request_template.md

Author: sdatkinson

.github/pull_request_template.md

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+**Thanks for making a Pull Request!**
+Please fill out this template so that you can be sure that your PR does everything it needs to be accepted.
+
+## Description
+What does your PR do?
+Include [Closing words](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue) to link this PR to the Issue(s) that it relates to.
+
+## PR Checklist
+- [ ] Does the VST3 plugin pass all of the unit tests in the [VST3PluginTestHost](https://steinbergmedia.github.io/vst3_dev_portal/pages/What+is+the+VST+3+SDK/Plug-in+Test+Host.html)? (Download it as part of the VST3 SDK [here](https://www.steinberg.net/developers/).)
+- [ ] Does your PR add, remove, or rename any plugin parameters?
+  - [ ] If yes, then have you ensured that older versions of the plug-in load correctly? (Usually, this means writing a new legacy unseralization function like [`_UnserializeStateLegacy_0_7_9`](https://github.com/sdatkinson/NeuralAmpModelerPlugin/blob/f755918e3f325f28658700ca954f8a47ec58d021/NeuralAmpModeler/NeuralAmpModeler.cpp#L823).)
+