Initial Public GitHub Repository Creation

The very first public commits appeared on GitHub for repositories like `google-cloud-cpp-common` and `google-cloud-cpp-pubsub`, laying the foundation for the open-source client libraries. This marked the shift from purely internal development to a publicly visible, open-source project.

Significance

This was the tangible beginning of the libraries as an external, community-facing project, allowing external developers to track progress and eventually contribute to their evolution.