Encoding Updates

[jefferypalmer]

Great project! We have added the base support for encoding a class to a binary AIS message as well in our fork and wondering if you're interested in pulling in these updates?

https://github.com/darren1713/AisParser/tree/DotNetStandard

There is a few notes for universal use:
Expand the testing framework to include encoding
Add the encoding function for text (not exactly sure about the exact character transformation required)
Add encode function for remaining message types after text field encoding

[chrisrichards]

Thanks for this, would love to bring these changes in. If you create a pull request we can take it from there. A couple of points though:

• I’d like to keep it on netstandard2.0 if possible
• could do with some tests for the binary encoding