Create documentation to guide users on validating SBOMs.

The CycloneDX Python library can validate an SBOM based on the schema, independent of the library's support for SBOM serialization, which is a valuable feature. However, the current documentation lacks clear examples and instructions on effectively utilizing this validation functionality.

The following points should be addressed in the documentation:

An overview of how to validate SBOMs based on schema specifications.
Examples demonstrating the validation process, including code snippets using JsonStrictValidator and other relevant classes.