Add cat binary

cat/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "cat"
+version = "0.1.0"
+authors = ["Eryn Wells <eryn@erynwells.me>"]
+
+[dependencies]

cat/src/main.rs

@@ -0,0 +1,14 @@
+use std::io;
+use std::io::Read;
+use std::io::Write;
+
+fn main() {
+    let mut buffer = String::new();
+    match io::stdin().read_to_string(&mut buffer) {
+        Ok(_) => match io::stdout().write(&buffer.as_bytes()) {
+            Ok(_) => {}
+            Err(err) => println!("Error writing: {:?}", err),
+        },
+        Err(err) => println!("Error reading: {:?}", err),
+    }
+}