docs: add quickstart guide with HTTP server and Go package examples

[Pratham-Mishra04]

Add Quickstart Guide to README

This PR adds a comprehensive quickstart guide to the README, making it easier for new users to get started with Bifrost. The guide includes:

• Prerequisites section with clear requirements
• Two main implementation paths:
  • Using Bifrost as an HTTP server (with both Go binary and Docker options)
  • Using Bifrost as a Go package with code examples

The PR also:

• Reorganizes the README structure to prioritize getting started information
• Adds utility functions StrPtr() and IntPtr() to the core package
• Updates code examples to use the new utility functions
• Improves formatting and readability throughout the documentation
• Moves the benchmarks section after the getting started section for better flow

These changes make Bifrost more accessible to new users while maintaining all the detailed information for advanced users.

[Pratham-Mishra04]

• docs: add quickstart guide with HTTP server and Go package examples #27 👈 (View in Graphite)
• main

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