Merge branch 'feature/messenger-client' into 'development'

...m/xcode/xcshareddata/xcschemes/XXMessengerClient.xcscheme

...e/xcshareddata/xcschemes/elixxir-dapps-sdk-swift.xcscheme

Docs/XXClient-quick-start-guide.md

Docs/XXMessengerClient.md

...codeproj/xcshareddata/xcschemes/ExampleApp (iOS).xcscheme

Package.swift

README.md

Sources/XXClient/CMixManager/CMixManager.swift

...ces/XXClient/CMixManager/Functors/CMixManagerCreate.swift

...es/XXClient/CMixManager/Functors/CMixManagerRestore.swift

Sources/XXClient/Functors/DownloadAndVerifySignedNdf.swift

Sources/XXClient/Functors/NewOrLoadUd.swift

Sources/XXClient/Functors/NewUdManagerFromBackup.swift

Sources/XXClient/Models/NDFEnvironment.swift

...MessengerClient/Messenger/Functors/MessengerConnect.swift

...XMessengerClient/Messenger/Functors/MessengerCreate.swift

...engerClient/Messenger/Functors/MessengerIsConnected.swift

...ssengerClient/Messenger/Functors/MessengerIsCreated.swift

...essengerClient/Messenger/Functors/MessengerIsLoaded.swift

...sengerClient/Messenger/Functors/MessengerIsLoggedIn.swift