Update README.md

Author: tobikli

README.md

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 # Theia Scale Tests
 
-This repository provides e2e tests for the [theia cloud ide](https://theia-cloud.io) regarding scalability.
+This repository provides E2E integration tests for the [Theia Cloud IDE](https://theia-cloud.io) regarding scalability.
+## Information:
+Tests are written using [Playwright](https://playwright.dev)
+Scaled tests run via the Playwright [Artillery](https://artillery.io) Framework (Potentially)
+## For Development:
+- Single User Playwright Tests are run using a Test Account for Keycloak, to change the Test User, change the environment variables in GitHub Secrets \
+-> Settings -> Secrets and variables -> Actions -> Secrets -> Repository Secrets \
+or [here](https://github.com/ls1intum/theia-scale-tests/settings/secrets/actions)