Added a PR template for projects. (ossu#1136)

Author: robbrit

.github/PULL_REQUEST_TEMPLATE/project_pr.md

@@ -0,0 +1,21 @@
+# Project Pull Request
+
+This template is for any submissions to our [projects list](https://github.com/ossu/computer-science/blob/master/PROJECTS.md).
+If you're submitting a pull request for any other part of the repo, don't use this
+template.
+
+Before you submit your project, there's a few things to check:
+
+* Have you followed the [code of conduct?](https://github.com/ossu/code-of-conduct)
+* Does this project violate the honor code of one of the courses in OSSU?
+
+If you've followed those two guidelines, then prepare a pull request for the project
+and a post for our Discord. Put the post in the [#projects channel](https://discord.com/channels/744385009028431943/881778556961701909),
+and ensure it contains some details for the community:
+
+* The description of the project.
+* Any courses or resources that were particularly helpful that you'd like to share.
+* Any learnings that you had while doing the project.
+* Questions that you have for the group, or any feedback you'd like to receive.
+
+If that's all good, create the pull request and send over your Discord post. Thanks!