Add a readme for graph ingestion pipeline

[vish-cs]

Added a new README for graph Ingestion pipeline and renamed the existing README

[gemini-code-assist]

Summary of Changes

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This pull request significantly updates the documentation for the ingestion pipeline. The existing README.md has been replaced with comprehensive details about the new GraphIngestionPipeline, which is an Apache Beam-based solution for loading graph data into Google Cloud Spanner. The previous README content, which focused on an older IngestionPipeline, has been archived into a new file to maintain accessibility to legacy information. This change aims to provide clear and up-to-date guidance for users interacting with the current graph ingestion system.

Highlights

• Documentation Update: The primary README for the ingestion pipeline has been completely revamped to describe the new GraphIngestionPipeline.
• New Pipeline Documentation: Detailed information about the GraphIngestionPipeline's key features, configuration options, and example usage has been added.
• Legacy Documentation Archival: The previous documentation for the IngestionPipeline has been moved to a new file, README_LegacyPipeline.md, to preserve historical context.

Changelog

• pipeline/ingestion/README.md
  • Replaced the entire content with documentation for the new GraphIngestionPipeline.
• pipeline/ingestion/README_LegacyPipeline.md
  • Added a new file containing the previous documentation for the IngestionPipeline.

Activity

• No specific activity (comments, reviews, progress) was provided in the context.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the ingestion pipeline. The existing README for the legacy IngestionPipeline is moved to README_LegacyPipeline.md, and a new README.md is added for the GraphIngestionPipeline. The new documentation is clear and aligns with the provided source code. I have one suggestion to improve the clarity of the data format detection mechanism.

[n-h-diaz]

Thanks for making a new readme!