Mail.com: added app password remark

app/src/main/res/xml/providers.xml

@@ -1651,7 +1651,8 @@
     </provider>
     <provider
         name="Mail.com"
-        documentation="Using third-party email clients requires a premium mail.com subscription. This is not a limitation of FairEmail."
+        appPassword="true"
+        documentation="Using third-party email clients requires a premium mail.com subscription. This is not a limitation of FairEmail. You might need to use an &lt;a href='https://support.mail.com/security/2fa/application-specific-passwords.html'&gt;app-specific password&lt;/a&gt;"
         domain="mail\\.com,email\\.com,usa\\.com,myself\\.com,consultant\\.com,post\\.com,europe\\.com,asia\\.com,iname\\.com,writeme\\.com,dr\\.com,cheerful\\.com,accountant\\.com,techie\\.com,engineer\\.com,linuxmail\\.org,musician\\.org,contractor\\.net,workmail\\.com,financier\\.com"
         link="https://support.mail.com/premium/imap/server.html#indexlink_help_premium_imap">
         <imap