Merge pull request #4 from RustPython/add-a-minimal-readme

Create README.md

Author: DimitrisJim

README.md

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+# RustPython Docs
+
+Contains additional documentation on RustPython. The book uses [mdBook](https://github.com/rust-lang/mdBook),
+information on installing, reading and writing an mdBook can be found in the [mdBook User Guide](https://rust-lang.github.io/mdBook/).