Add Quick Start section to README

[Subramanya-Veeregowda]

Added a beginner-friendly quick start section to improve onboarding experience.

and improved the description Apache beam website description in the table

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the onboarding experience for new users by integrating a beginner-friendly quick start guide directly into the main README.md. Additionally, it refines the description of the Apache Beam website within the documentation, ensuring clearer and more accurate information for users seeking resources.

Highlights

• Quick Start Section Added: A new "🚀 Quick Start (Beginner Friendly)" section has been introduced to the README.md, providing a structured guide for new users to get started with Apache Beam, including language selection, running examples, and understanding core concepts.
• Apache Beam Website Description Improved: The description for the Apache Beam Website entry in the resources table within README.md has been updated to be more informative, clarifying its content as the official website with documentation, concepts, and guides.

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