Add `version.json` to match go-multicodec

[sumanjeet0012]

go-multicodec has a version.json file that tracks the library version. py-multicodec should have one for consistency across the multiformats ecosystem.

Problem

go-multicodec includes:

{
  "version": "v0.10.0"
}

This file is used by ecosystem tooling to track version compatibility across implementations. py-multicodec does not have this file — version info exists only in pyproject.toml and __init__.py.

Proposed Solution

1. Create version.json at the repository root:

   {
     "version": "v1.0.0"
   }

2. Add it to the bump-my-version configuration in pyproject.toml so it's updated automatically on release:

   [[tool.bumpversion.files]]
   filename = "version.json"
   search = '"version": "v{current_version}"'
   replace = '"version": "v{new_version}"'

Related

• Go equivalent: go-multicodec version.json