[No QA] Add KSv2.md file

contributingGuides/KSv2.md

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+# KSv2
+
+In Expensify, we use a prioritization system called called "Kernel Scheduler v2" (KSv2) to help us keep aligned on how frequently GitHub issues should be worked on, depending on their time priority:
+
+**Hourly**: If a Github issue has the `Hourly` label, the assignee should update it *at least* once an hour
+
+**Daily**: If a Github issue has the `Daily` label, the assignee should update it *at least* once a day
+
+**Weekly**: If a Github issue has the `Weekly` label, the assignee should update it *at least* once a week
+
+**Monthly**: If a Github issue has the `Monthly` label, the assignee should update it *at least* once a month.
+
+## Dashboard
+
+To help surface the issues that need the most #urgency, we've built a custom extension to use in GitHub. It looks like this:
+
+<img src="https://user-images.githubusercontent.com/6829422/212977549-7e1b0b48-1c6f-4c90-a05e-26e6e2ba9926.png" />
+
+In the dashboard, you can see all your issues broken down from urgent to least urgent. Issues will also change color depending on other factors - eg, if they have "HOLD" in the title or if they have the `Overdue`, `Planning`, or `Waiting for copy` labels applied.
+
+If a GitHub issue has the `Overdue` label, it means that it hasn't been updated in the amount of time allotted for an update (ex - A weekly issue becomes overdue if it hasn't been updated in a week).
+
+## Installation
+
+You can install the KSv2 extension from [here](https://github.com/Expensify/k2-extension/). As a best practice, before you start working on assigned tasks, go to the [K2 dashboard](https://github.com/Expensify/Expensify#k2). At the top of the page, it lists all your assigned issues organized by priority. Anything with red text is overdue - make sure to address these first. That's it!
+