docs: add masternode network section and v0.0.3/v0.0.4 changelog entries

[xdustinface]

Summary

Documentation follow-up to #4 (masternode network generator), preparing for the v0.0.4 release.

Changes

README

• New "Masternode Network" section documenting the regtest-mn.tar.gz release artifact, the exported directory layout, and the DASHD_MN_DATADIR convention consumers like rust-dashcore/dash-spv integration tests use.
• Adds generate_masternode.py usage examples (default 8 DKG cycles, custom --dkg-cycles, --output-dir).
• "Project Structure" listing updated to include generate_masternode.py and generator/masternode_network.py.

CHANGELOG

• New v0.0.4 entry for #4 with the asset list (regtest-mn.tar.gz, regtest-40000.tar.gz, regtest-200.tar.gz).
• Retroactive v0.0.3 entry for the existing 200-block release (release-only bump, no PR).

Test plan

• CI pre-commit job passes (lint + unit tests).
• After merge: tag v0.0.4 on main and cut a GitHub Release with regtest-mn.tar.gz, regtest-40000.tar.gz, and regtest-200.tar.gz attached, using the new CHANGELOG section as the release body.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: efeffd38-4648-44b1-84c4-1b705a1cfa61

📥 Commits

Reviewing files that changed from the base of the PR and between 7a22e79 and 4e66630.

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/v0.0.4-release

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