Package level README.md for common_msgs

[gavintranquilino]

• Includes steps for how to add more .msg files to the common_msgs folder.
• Usage guide to include the common_msgs to existing modules inside their respective Dockerfiles, CMakeLists.txt, and package.xml dependencies
• Follows the Humanoid Documentation Format/Structure

[Copilot]

Pull Request Overview

This PR introduces a package-level README for the common_msgs package that documents its structure, purpose, usage guidelines for integration (via Dockerfiles, package.xml, CMakeLists.txt, and code imports), and testing instructions.

• New README to support adding and using additional message (.msg) files
• Documentation follows the Humanoid Documentation Format for consistency across the project

Comments suppressed due to low confidence (2)

autonomy/wato_msgs/common_msgs/README.md:21

• [nitpick] Consider reviewing the bullet list syntax used in the 'Inputs & Outputs' section; using the '-' character for bullets works in markdown but may be confused with diff markers. If possible, consider an alternative bullet symbol or formatting (such as '*' or indenting) to improve clarity for readers.

-   **Outputs**: Provides `.msg` definitions that other ROS 2 packages can import and use.

autonomy/wato_msgs/common_msgs/README.md:25

• [nitpick] Similarly, in the 'Key Features' section, the use of '-' for bullet points might be mistaken for deletion markers in diff views. Consider using a consistent alternative bullet style to improve readability.

-   **Message Definitions**: Contains a collection of `.msg` files, each defining a specific data structure. These messages are designed to be generic and applicable in multiple contexts.