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Rust: Add a palindrome checker and a max number finder

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This pull request adds an example of a palindrome checker and also a maximum number finder

Can not build generated templates for Android (=armv7-a"" was unexpected at this time.)

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**Describe the bug** The generated templates code doesn't build for Android. **Steps To Reproduce** Follow the Readme and https://hackmd.io/XIcEwk4GSxy8APZhSa0UnA?view to set up cargo-mobile. Initialise a project with the `egui` (or...