Update README.md: .Net version + example code

[XertroV]

The default LoginAsync method doesn't work for me. I get a permissions error with Trackmania date=2024-03-18_16_00 git=126882-1ec72453936 GameVersion=3.3.0

This updates the readme example to use a more verbose connect/auth flow but it works for me (and evo csharp controller does things in this order too)

Unhandled exception. GbxRemoteNet.Exceptions.XmlRpcFaultException: (-1000) Permission denied.
   at GbxRemoteNet.GbxRemoteClient.CallOrFaultAsync(String method, Object[] args)
   at GbxRemoteNet.GbxRemoteClient.SetApiVersionAsync(String version)
   at GbxRemoteNet.GbxRemoteClient.LoginAsync(String login, String password)

[sonarcloud]

Quality Gate passed

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See analysis details on SonarCloud

[snixtho]

It is correct that the readme uses LoginAsync, the AuthenticateAsync is a direct XMLRPC call and only really used for more custom implementations such as EvoSC#. If LoginAsync doesn't work, it is a bug.