add FAQ section in README based on some common issues

Author: Danielweng0902

README.md

@@ -131,6 +131,86 @@ English   |   [Indonesia](README_IN.md)   | &
 
 </div>
 
+## Frequently Asked Questions (FAQ)
+
+This FAQ summarizes common issues encountered by chatGPTbox users and provides suggested solutions based on discussions in the GitHub Issues section.
+
+If you still haven't found what you're looking for, please submit an [Issue](https://github.com/josStorer/chatGPTBox/issues).
+
+
+### Cannot login to ChatGPT.com with this extension active using Brave web browser
+
+#### [#794]( https://github.com/josStorer/chatGPTBox/issues/794 )
+
+encounter 'something went wrong' with ChatGPTBox extension enabled
+
+**Possible causes:**
+- The extension modifies some network requests or page content, which may interfere with the ChatGPT.com login flow.
+
+- Brave browser’s built-in privacy protections( shields, blocking scripts or cookies ) may conflict with the extension.
+
+**Solution:**
+1. disable the extension
+2. Log in
+3. Re-enable it
+
+**not officially fixed yet**
+
+
+### Google Gemini not working
+
+#### [#786]( https://github.com/josStorer/chatGPTBox/issues/786 ), [#757]( https://github.com/josStorer/chatGPTBox/issues/757 )
+
+Sometimes working
+**not officially fixed yet**
+
+**Possible causes: **
+
+- Google Gemini’s web interface/API may have changed or is unstable.
+
+- The ChatGPTBox extension’s current integration with Gemini is incomplete or experimental.
+
+- Authentication or session handling is inconsistent.
+
+- Gemini may block access depending on region or account type. 
+
+**Possible solutions: **
+
+- Try refreshing the page or restarting the browser. 
+
+- Try logging out of Google and logging in again. 
+
+- Check if there is an updated version of the extension — newer versions may fix compatibility issues.
+
+
+
+### bilibili not working correctly
+
+#### [#732]( https://github.com/josStorer/chatGPTBox/issues/732 ), [#703]( https://github.com/josStorer/chatGPTBox/issues/703 )
+
+** Possible causes: **
+
+- Bilibili uses dynamic page loading (SPA) and complex DOM structure, which may interfere with the extension’s side panel injection. 
+
+- The site may block iframe embedding or restrict third-party scripts. 
+
+- Bilibili’s CSS appears to override the Markdown styles used by the extension.
+
+- Conflicts with bilibili’s own content scripts or other extensions. 
+
+- Extension may not detect the correct text input areas on the site.
+
+**Possible solutions: **
+
+
+- Try enabling floating window mode in ChatGPTBox settings.This works better on sites that block side panels.
+
+- Test on different pages (e.g. video page vs. homepage vs. comments)
+
+- Try disabling other extensions that interact with Bilibili.
+
+
+
 ## Credit
 
 This project is based on one of my other repositories, [josStorer/chatGPT-search-engine-extension](https://github.com/josStorer/chatGPT-search-engine-extension)