Add transpiler for JUnit tests

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+# Transpile Tests
+
+This module may be helpful if you want to create an implementation of Simple in another language.
+It can parse the JUnit tests to automatically translate most of the boilerplate.
+Some manual tweaks will still be required though, because only common patterns are detected.
+
+## Usage
+
+Just call `JUnitParser.parseRepository` to get a list of parsed test classes for each chapter,
+and implement a pretty printer for your favourite language.
+
+For an example you can refer to `printers.RustPrinter`,
+which produces tests similar to the ones used by
+[Simple-Rust](https://github.com/SeaOfNodes/Simple-Rust).
+
+Note that although all tests of all chapters are parsed,
+you probably only want to transpile the latest test of each chapter.
+For the rest you can just manually port the small changes between chapters.