Update README

README.md

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 # A byte-code virtual machine lox interpreter written in C++
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+This is a C++ implementation of the Lox programming language as I work through Robert Nystrom's wonderful book [Crafting Interpreters](https://craftinginterpreters.com/).
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+The implementation does lean on some C++23 language/library features and so will require gcc-13 or clang-16. You can find docker development environments here [clang](https://github.com/kevinjoseph1995/dev_env/tree/main/clang) and [gcc](https://github.com/kevinjoseph1995/dev_env/tree/main/gcc).
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 Work in progress
 - [x] Global variables
 - [x] Lexical Scopes and scoped local variables