Add a PR template

Author: James Munns

.github/pull_request_template.md

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+Thanks for submitting!
+
+## Category
+
+Is this PR a:
+
+- [ ] New Not Yet Awesome item?
+- [ ] A WIP project addressing an open item?
+- [ ] Removing a Not Yet Awesome item?
+
+## New Not Yet Awesome item checklist
+
+- [ ] Is the request clearly stated, linking to relevant documentation, such as a whitepaper, protocol definition, datasheet, etc.?
+- [ ] Are the "Success Criteria" defined?
+- [ ] Is this request possible using today's Rust (not blocked by LLVM impl, rustc impl, etc.)?
+- [ ] Is this request broken into reasonable work packages, such as "Create HAL for XYZ chip", not "support all boards from ABC vendor"?
+
+## WIP Project checklist
+
+- [ ] Is there a link to the source project on GitHub/GitLab/etc?
+- [ ] Is the project open source?
+- [ ] Is it clear if contributions are welcome?
+- [ ] Is the project relevant to the TODO item it addresses?
+- [ ] Is the project more than just an empty repo or a placeholder (e.g. just a "hello world" `bin.rs`/`lib.rs`)?
+
+## Remove an item checklist
+
+- [ ] Has the project that fixes the item been mentioned in the PR?
+- [ ] Does the project address the original request fully?
+- [ ] Has the crate that addresses the request has been added to the [Awesome Embedded Rust] list?
+- [ ] Has the crate has been published on crates.io (or somewhere else where other people can consume it)?
+
+[Awesome Embedded Rust]: https://github.com/rust-embedded/awesome-embedded-rust