Add masp docs

[drewstone]

Overview

Provide a detailed description of proposed changes.

• add masp docs to protocol

Proposed area of change

Put an x in the boxes that apply.

• [ ] Overview
• [ ] Anchor System
• [ ] dApps
• [ ] Tangle
• [x] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

Specify any issues that can be closed from these changes (e.g. Closes #233).

• Closes

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Code Checklist

• [ ] I have tested that prove my changes are working as intended
• [ ] I have added necessary documentation (if appropriate)

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