Create README.md

Author: 0xNathanW

README.md

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+# Interpreter
+A "Clox" compiler, described in the book "Crafting Interpreters" by Robert Nystrom.
+
+## Usage
+Build with Cmake:
+```
+~/Interpreter$ mkdir build
+~/Interpreter$ cd build
+~/Interpreter$ cmake ..
+~/Interpreter$ make
+```
+Run without argument for REPL, otherwise provide a source file as the first argument.