Create premium README.md for Syphio

[ludo62]

Adds an SEO-optimized, highly professional README.md establishing Syphio as the advanced Shopify Liquid Linter. Includes sections for Value Proposition, Architecture, an Example Rule, CLI Coming Soon, and Call to Action.

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PR created automatically by Jules for task 11517353909982163127 started by @ludo62

[google-labs-jules]

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