docs: add pre-review checklist (#891)

* chore: add pre-review checklist

* docs: update checklist from feedback

* docs: fix grammar

Author: brotherlymite

.github/pull_request_template.md

@@ -0,0 +1,11 @@
+### Pre-review checklist:
+
+- [ ] I have run a spell check on the write-up and made sure no typos exist.
+- [ ] References to Snapshot/governance forum are correct on the AIP. If no snapshot exists, make sure no TODO's exist.
+- [ ] The specification on the writeup is aligned with the forum, snapshot, and the payload contract. If there are any changes, they are explicitly mentioned/communicated.
+- [ ] Minimal tests exist, and the snapshot diff report generated is the latest one and aligned with the payload.
+- [ ] If deploy scripts are manually updated from the generated ones, I have carefully validated that they are correct, including the deploy commands and the proposal-creation script.
+- [ ] If the aave-helpers submodule is updated, I have validated it is pointing to the latest version.
+- [ ] I have validated that no unused files and imports are being added.
+- [ ] For an asset listing, the write-up includes a detailed specification of the price feed used, CAPO adapters (with each CAPO layer described separately), and eModes (with tables) if changed.
+- [ ] Wherever possible, I have validated that addresses from the address book are used instead of raw addresses.