Add initial implementation of Docker Compose manager and example usage

- Introduced DockerComposeManager class for programmatically creating and managing Docker Compose YAML files.
- Added example script demonstrating usage of DockerComposeManager.
- Created tests for service creation, modification, and removal.
- Included project metadata in pyproject.toml and added linting instructions in copilot-instructions.md.

.github/copilot-instructions.md

@@ -0,0 +1,7 @@
+This Python library is used to create Docker compose.yaml files from Python classes.
+
+It is designed to simplify the process of defining and managing Docker Compose configurations programmatically.
+
+Uses uv for Python dependency management. `uv sync`, `uv add <package>`.
+
+Ruff is used for linting and formatting. Use `ruff check .` to check the code and `ruff format .` to format it.