docs: add migration guide to v5

Author: Belco90

README.md

@@ -50,6 +50,7 @@ $ yarn add --dev eslint-plugin-testing-library
 You can find detailed guides for migrating `eslint-plugin-testing-library` in the [migration guide docs](docs/migration-guides):
 
 - [Migrate guide for v4](docs/migration-guides/v4.md)
+- [Migrate guide for v5](docs/migration-guides/v5.md)
 
 ## Usage
 

docs/migration-guides/v5.md

@@ -0,0 +1,25 @@
+# Guide: migrating to v5
+
+Assuming you are already in v4, migrating to v5 will be easy. If you are not in v4 yet, we recommend you to follow [the proper guide to migrate to it](docs/migration-guides/v4.md).
+
+## Overview
+
+- Support for ESLint v8
+- Drop support for Node v10 - required node version is now `^12.22.0 || ^14.17.0 || >=16.0.0`. Node v10 was EOL'd in April 2021, and ESLint v8 dropped support for it too.
+- Update dependencies
+- `no-debug` is now called `no-debugging-utils`
+- `no-render-in-setup` is now enabled by default in the Angular, React & Vue configs
+- `no-unnecessary-act`'s `isStrict` option is now `true` by default
+- `no-unnecessary-act` is now enabled by default in the React config
+- `no-wait-for-multiple-assertions` is now enabled by default in all configs
+- `no-wait-for-side-effects` is now enabled by default in all configs
+- `no-wait-for-snapshot` is now enabled by default in all configs
+- `prefer-presence-queries` is now enabled by default in all configs
+- `prefer-query-by-disappearance` is now enabled by default in all configs
+
+## Steps to upgrade
+
+- `eslint-plugin-testing-library` supports both ESLint v7 and v8, so you are fine with either version
+- Make sure you are using a compatible Node version, and update it if it's not the case
+- Rename `testing-library/no-debug` to `testing-library/no-debugging-utils` if you were referencing it manually somewhere
+- Be aware of new rules enabled in Shared Configs which can lead to new reported errors