Card Struct

Added first version of Card struct. Also added an ability for it to be printed out through rust standard functions.

Reviewed-on: #10

src/lib.rs

@@ -1,9 +1,9 @@
 use std::error::Error;
 
 mod card;
-mod hand;
 mod deck;
 mod gamestate;
+mod hand;
 
 pub fn run() -> Result<(), Box<dyn Error>> {
     println!("Hello, world!");