Merge from implementation branch

Documentation/working_notes.md

DummyClient/Program.cs

E2ETests/SenderTest.cs

FitConnect/BaseClasses/FunctionalBaseClass.cs

FitConnect/FluentSender.cs

FitConnect/Models/FitConnectException.cs

FitConnect/Models/Metadata.cs

FitConnect/Models/ServiceType.cs

FitConnect/Models/Submission.cs

FitConnect/Sender.cs

FitConnect/Subscriber.cs

Models/Models.csproj

Services/FitConnectApiService.cs

Services/Models/Api/Metadata.cs

Services/Models/Api/SecurityEventToken.cs

Services/Models/Submission/SubmitSubmissionDto.cs

Services/Services.csproj

readme.md