Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+Before submitting this pull request, check the changes to see it's only the changes you made intentionallly
+If there are changes to other lines you didn't make deliberately, it's possible that your IDE made the changes with a utility like prettier.
+Next time, make sure that you only add your changes by using `git add -p` and rather than `git add Contributors.md`
+
+If you're doing something in the checklist below, put an `x` inside `[ ]` so that `- [ ]` becomes `- [x]`
+
+- [ ] I had fun going through this tutorial (ノ^o^)ノ and learned on the way ٩(＾◡＾)۶
+- [ ] There are some things I'd like to improve in this tutorial. I have written them below.
+- [ ] There were steps where I had errors while following this tutorial. I have written them below.