feat(ui/testing): README - add important links for reading

ui/testing/README.md

@@ -173,6 +173,12 @@ $ pnpm test:specs --target <target_file>
 * There are some custom matchers that you can use (`$any`, `$arrayValues`, `$objectValues`, `$ref`, `$reactive`) and also some extra @vue/test-utils mount() additions (`$style`, `$computedStyle`): [code](https://github.com/quasarframework/quasar/blob/dev/ui/testing/setup.js)
 * Use of Copilot when writing the tests is allowed ;)
 
+Important reading list:
+* https://vitest.dev/api/expect.html
+* https://test-utils.vuejs.org/api/
+* https://vitest.dev/api/
+* https://vitest.dev/api/vi.html
+
 ## Common formulas for writing tests
 
 > When instructed to search for something, do it in /ui/src/**/*.test.js files.