chore: Add logaf guide to CONTRIBUTING docs (#5985)

Author: AbhiPrasad

CONTRIBUTING.md

@@ -80,7 +80,24 @@ When contributing to the codebase, please note:
 
 - Non-trivial PRs will not be accepted without tests (see above).
 - Please do not bump version numbers yourself.
-- [`raven-js`](https://github.com/getsentry/sentry-javascript/tree/3.x/packages/raven-js) and [`raven-node`](https://github.com/getsentry/sentry-javascript/tree/3.x/packages/raven-node) are deprecated, and only bug and security fix PRs will be accepted targeting the [3.x branch](https://github.com/getsentry/sentry-javascript/tree/3.x). Any new features and improvements should be to our new SDKs (`browser`, `node`, and framework-specific packages like `react` and `nextjs`) and the packages which support them (`core`, `hub`, `integrations`, and the like).
+- [`raven-js`](https://github.com/getsentry/sentry-javascript/tree/3.x/packages/raven-js) and [`raven-node`](https://github.com/getsentry/sentry-javascript/tree/3.x/packages/raven-node) are deprecated, and only bug and security fix PRs will be accepted targeting the [3.x branch](https://github.com/getsentry/sentry-javascript/tree/3.x). Any new features and improvements should be to our new SDKs (`browser`, `node`, and framework-specific packages like `react` and `nextjs`) and the packages which support them (`core`, `utils`, `integrations`, and the like).
+
+## PR reviews
+
+For feedback in PRs, we use the [LOGAF scale](https://blog.danlew.net/2020/04/15/the-logaf-scale/) to specify how important a comment is:
+
+* `l`: low - nitpick. You may address this comment, but you don't have to.
+* `m`: medium - normal comment. Worth addressing and fixing.
+* `h`: high - Very important. We must not merge this PR without addressing this issue.
+
+You only need one approval from a maintainer to be able to merge. For some PRs, asking specific or multiple people for review might be adequate.
+
+Our different types of reviews:
+
+  1. **LGTM without any comments.** You can merge immediately.
+  2. **LGTM with low and medium comments.** The reviewer trusts you to resolve these comments yourself, and you don't need to wait for another approval.
+  3. **Only comments.** You must address all the comments and need another review until you merge.
+  4. **Request changes.** Only use if something critical is in the PR that absolutely must be addressed. We usually use `h` comments for that. When someone requests changes, the same person must approve the changes to allow merging. Use this sparingly.
 
 ## Publishing a Release