ft: add readme

README.md

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+# brainfuck-rs
+
+This is a simple [brainfuck](https://en.wikipedia.org/wiki/Brainfuck) implementation is Rust
+
+Why? Because I needed it for a university assignment.
+
+
+## Usage
+
+Compile using `cargo`, then provide a file with the brainfuck code:
+```bash
+$ cargo run -- examples/hello_world.bf
+Hello World!
+```
+Also has some debug prints:
+```bash
+$ RUST_LOG=info cargo run -- examples/hello_world.bf
+$ RUST_LOG=debug cargo run -- examples/hello_world.bf 
+```