Updated README to clarify purpose and key features of Classiq.

[Smoothengineer]

PR Description

This pull request enhances the README for the Classiq repository by improving formatting, adding clarifications, and rewording sections for better readability and coherence. The changes focus on:

• Improving the clarity of example explanations and steps for using the SDK and platform.

• Fixing minor formatting issues such as consistent use of headings, bullet points, and code blocks.

• Enhancing the flow of the documentation to better guide users through the process of creating and running quantum programs.

Some notes

• [x] Please make sure that you placed the files in an appropriate folder

• [x] And that the files have indicative names.

• [x] Please note that Classiq runs automatic code linting, which may minorly alter some files.

  • [x] If you're familiar with pre-commit, you may run pre-commit install, and then at each commit, your files will be altered in a similar way