Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+Please fill in this template.
+
+- [ ] Use a meaningful title for the pull request. Include the name of the resource added.
+- [ ] Add a short sentence on why do you think the resource you're adding is awesome!
+- [ ] Make sure your addition maintains the alphabtical order of the list.
+- [ ] Make sure your addition contains a description besides the link.
+
+Make sure to check out the [CONTRIBUTION GUIDELINES](https://github.com/aalhour/awesome-compilers/blob/master/CONTRIBUTING.md).