Rust (readonly) support for the CP437 encoding

cp537 aka DOS-US / OEM-US was widley used ~1980.

this crate supports reading the encoding in rust

install

cp437 = "*"

example

```rust

let mut f = File::open("...").unwrap();
let mut bytes = f.bytes();
let mut r = Reader::new(&mut bytes);

println!("Kurzname {}", r.consume(12)); // Kurzname

```

there is also a convert method you can use to convert a char byte by byte