Updating README.md file

[ghost]

this PR does basically aim at:

• fixing language in README.md file
• adding separators

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this does basically aim at:

• making README.rst file easier to be read;
• making README.rst file simpler to be read;
• making README.rst file more direct to be understood;
• making README.rst file more direct to be read;
• making README.rst file simpler to be understood;
• making README.rst file easier to be understood;