Add a new encoding scheme to this repository.

Constraints:
- Follow copilot-instructions.md strictly
- Do not modify unrelated code
- Use existing codec patterns

Task:
Add encoding: {{ENCODING_NAME}}

Requirements:
- Implement according to ADDING_CODECS.md guideline
- Add tests if needed (if `__examples__` cannot be consistently defined)
- Add minimal documentation (in the relevant category page under `docs/pages`)

Reference:
{{LINK_OR_DESCRIPTION}}