Update README: fix Usage code fences and add XENE Tokenomics section

[mamonaminyar1998]

Motivation

• Clarify and fix formatting in the Usage section so the build and run commands render correctly in the README.
• Provide high-level documentation about XENE tokenomics to capture the project's economic goals and incentives.

Description

• Adjusted code block formatting and indentation in the Usage steps to ensure proper rendering of git clone, dotnet build, and dotnet run commands.
• Added a new XENE Tokenomics section outlining goals for Security, Decentralization, Sustainability, and Ecosystem Development.
• Added a newline at end of file to normalize file termination.

Testing

• No automated tests were run because this is a documentation-only change.

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Codex Task

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: eba32281-dbc6-4013-b922-eface7e33e74

📥 Commits

Reviewing files that changed from the base of the PR and between 6f45422 and 257900c.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/implement-responsive-transformer-tabs-xdaxfi

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