Add contributor/reviewer checklistchecklist

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@@ -11,3 +11,15 @@ Previously, some older branches were also regularly supported, and while they sh
 * morty
 
 If you are developing with meta-updater, it may be helpful to read the README and other documentation for link:README.adoc[this repo], https://github.com/advancedtelematic/aktualizr[aktualizr], and the https://github.com/advancedtelematic/updater-repo/[updater-repo], particularly the sections about development and debugging.
+
+== Contributor checklist
+
+* OTA-enabled build succeeds at least for one platform, the resulted image boots. This check is absolutely necessary for every pull request unless it only touches documentation.
+* If your change is touching platform code (like `classes/sota_<platform>.bbclass`), please check build and update on this particular platform.
+* oe-selftest succeeds. To test meta-updater, run `oe-selftest -r updater` from a build directory with `MACHINE` set to `qemux86-64`.
+* Updates are forwards- and backwards-compatible. You should be able to update an OTA-enabled build before the change is applied to the version with change applied and vice versa. One should pay double attention to the compatibility when bootloader code is affected.
+
+We understand that making all these tests might be overly tedious taking in account build times in Yocto. Please add a comment to your PR describing the tests you've made.
+
+== Approval
+PR approval should be accompanied by a comment describing what tests have been made by the reviewer.