add marshaller for application/x-www-form-urlencoded

[tuhao1020]

#7

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[tuhao1020]

@googlebot I signed it!

[johanbrandhorst]

I'm confused by this. From what I can tell, this is a copy paste of the JSON encoder? I'm really confused. Even if this was a complete implementation of a url-encoded form marshaler, I'm not convinced it needs to be part of this repository. If you need a marshaler like this today, you can just implement the Marshaler interface and use a runtime.WithMarshaler option.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.