Added README.md to the package

README.md

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+# image_common
+
+[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](LICENSE)
+[![Version](https://img.shields.io/badge/version-6.4.7-green.svg)](CHANGELOG.rst)
+
+A collection of ROS 2 packages providing core infrastructure for working with images and cameras in robotic systems. Part of the [ROS Perception](https://github.com/ros-perception) stack.
+
+## Packages
+
+### [image_transport](image_transport/)
+
+The core image transport library. Provides a plugin-based architecture for publishing and subscribing to images in raw or compressed form, transparently switching between transports without changing application code.
+
+- `Publisher` / `CameraPublisher` — publish images with optional camera info
+- `Subscriber` / `CameraSubscriber` — subscribe to images with transport hints
+- `SubscriberFilter` — integration with `message_filters`
+- `republish` node — re-publish images between transports
+- `list_transports` — list available transport plugins
+- Lifecycle node support and QoS override
+
+### [image_transport_py](image_transport_py/)
+
+Python bindings (pybind11) for `image_transport`, exposing `ImageTransport`, `Publisher`, `Subscriber`, `CameraPublisher`, and `CameraSubscriber` to Python 3 nodes.
+
+### [camera_calibration_parsers](camera_calibration_parsers/)
+
+Read and write `sensor_msgs/CameraInfo` calibration data to/from disk.
+
+- YAML (`.yaml` / `.yml`) and INI (`.ini`) format support
+- `convert` command-line tool for format conversion
+
+### [camera_info_manager](camera_info_manager/)
+
+C++ `CameraInfoManager` class for camera drivers that need to load, save, and serve calibration data.
+
+- Loads calibration from `file://`, `package://`, and other URL schemes
+- Handles `sensor_msgs/SetCameraInfo` service requests
+- Thread-safe; supports lifecycle nodes
+
+### [camera_info_manager_py](camera_info_manager_py/)
+
+Pure Python equivalent of `camera_info_manager` for Python-based camera drivers.
+
+- `CameraInfoManager` and `ZoomCameraInfoManager` classes
+- YAML-based calibration storage
+- Drop-in counterpart to the C++ package
+
+## Installation
+
+### From binary packages
+
+```bash
+sudo apt install ros-$ROS_DISTRO-image-common
+```
+
+### From source
+
+```bash
+mkdir -p ~/ros2_ws/src
+cd ~/ros2_ws/src
+git clone https://github.com/ros-perception/image_common.git
+cd ~/ros2_ws
+rosdep install --from-paths src --ignore-src -r -y
+colcon build --packages-select image_common
+```
+
+## Tutorials
+
+Step-by-step tutorials for writing publishers and subscribers with `image_transport` are available in the companion repository:
+
+**[ros-perception/image_transport_tutorials](https://github.com/ros-perception/image_transport_tutorials/)**
+
+Topics covered include:
+
+- Publishing and subscribing to images with `image_transport`
+- Using transport hints to select a specific transport
+- Writing a custom transport plugin
+- Python usage via `image_transport_py`
+
+## ROS 2 Distro Support
+
+| Distro  | Branch      |
+|---------|-------------|
+| Rolling | `rolling`   |
+| Jazzy   | `jazzy`     |
+| Iron    | `iron`      |
+| Humble  | `humble`    |
+
+## Contributing
+
+Contributions are welcome. Please open issues and pull requests on [GitHub](https://github.com/ros-perception/image_common).
+
+## License
+
+BSD 3-Clause. See [LICENSE](LICENSE) for details.