[Enhancement] Add Implicit conversion from Error to FailResult

[RHaughton]

Just like the Implicit Conversion to Ok Result.

just return;
return new Error("msg");

instead of :
return Result.Fail(new Error("msg");

[RHaughton]

just added a pull request : #160

[altmann]

Thanks for your feedback. I think its a good idea. I reviewed your pr and left some comments.

[RHaughton]

Just made the necessary changes and added the unit tests. Let me know what you think.

[altmann]

Released with https://www.nuget.org/packages/FluentResults/3.15.0