Add FAQ content about logging in with Google Auth

Author: mintlify[bot]

support/faq.mdx

@@ -0,0 +1,20 @@
+# Authentication
+
+## How do I log in to Mintlify?
+
+Mintlify only supports Google Authentication for login. To log in to Mintlify using Google Auth:
+
+1. Navigate to the Mintlify login page
+2. Click on the "Sign in with Google" button
+3. You'll be redirected to Google's authentication page
+4. Enter your Google credentials (email and password)
+5. Grant the necessary permissions when prompted
+6. You'll be automatically redirected back to Mintlify and logged in
+
+If you encounter any issues during the Google Auth login process, please ensure:
+- Your browser allows pop-ups from Mintlify
+- You're using a supported browser (Chrome, Firefox, Safari, Edge)
+- Your Google account has the necessary permissions
+- You've cleared your browser cache if experiencing persistent issues
+
+For additional support, contact our team through the help center.