docs: add CONTRIBUTING.md #13

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10 warnings

Converting null literal or possible null value to non-nullable type.

A publish profile with the name 'win-x64.pubxml' was not found in the project. Set the PublishProfile property to a valid file name.

The variable 'ex' is declared but never used

'RaygunClientBase.User' is obsolete: 'Provide a `IRaygunUserProvider` to the RaygunClient constructor instead.'

'RaygunClientBase.UserInfo' is obsolete: 'Provide a `IRaygunUserProvider` to the RaygunClient constructor instead.'

'RaygunClientBase.Send(Exception)' is obsolete: 'Please use SendAsync() to avoid possible deadlocks'

'RaygunClientBase.Send(Exception, IList<string>)' is obsolete: 'Please use SendAsync() to avoid possible deadlocks'

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.