encode method
*[<Null safety>](https://dart.dev/null-safety)*
Future<EncodedContent> encode (String decoded)
override
This is called to encode the content
Implementation
@override
Future<xmtp.EncodedContent> encode(String decoded) async =>
xmtp.EncodedContent(
type: contentTypeText,
parameters: {'encoding': defaultEncoding},
content: utf8.encode(decoded),
);