Docs for each package in wireline-core

[okdistribute]

A simple README with the API, use case example would do. Explore using jsdoc and standard-version for generating changelogs and readmes from the code/commit history.

• [ ] megafeed
• [ ] broadcast
• [ ] protocol
• [ ] signal
• [x] framework
• [ ] feed-store
• [ ] codec-protobuf