Added examples and better error reporting

+ The field that errors is now reported
+ The formats/ dir contains all predefined formats
  + Includes CCSDS packet for now
+ There appears to be an issue with bit formatting, the APID field is not being parsed correctly (upper 8 bits is not being factored in

src/main.rs

@@ -35,6 +35,6 @@ fn main() {
 
     match format.format_data(&data) {
         Ok(data_str) => println!("{}", data_str),
-        Err(e) => println!("Unable to format data: {}", e)
+        Err(_) => println!("Error formatting data")
     }
 }