added readme

README.md

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+# brainfuck
+
+This is a brainfuck interpreter with an interractive mode written in rust which can read from files; you can also read from piped data but reading user input "," will not work.  
+It can also run in --interractive mode (-i) or with --verbose (-v) which for now only shows what the memory looks like after the code is executed. 
+If a file is specified in interractive mode it will run first.  
+You can quit with Control-C.
+
+## Building from source
+You need to have rust and cargo installed and be in the project directory  
+
+    cargo build --release
+
+You can then find the executable at `target/release/brainfuck` or run with `cargo run --release` directly
+
+![demo](./demo.png)