docs: add marketmakder docs

[jaybxyz]

Description

This PR adds CLI and API documents for the marketmaker module.

Tasks

• [x] Add cli document
• [x] Add api document

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• [ ] Appropriate labels applied
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• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Code follows the module structure standards.
• [ ] Wrote unit and integration
• [ ] Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• [ ] Added relevant godoc comments.
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