Selenium Undetected Standalone Chromedriver README with bugfix

undetectedChromedriver/README.md

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+# Selenium Undetected Standalone-Chromedriver
+
+Selenium Standalone-Chromedriver with Undected-Chromedriver applied
+
+## Bug
+
+```txt
+Could not start a new session. Response code 500. Message: session not created: probably user data directory is already in use,
+```
+
+Go into the `/home/seluser` director in the container and run `rm -rf ~/.config/google-chrome/Singleton*`
+
+If it doesn't work, the log can be found in the set profile folder in the file `chrome_debug.log`