smap -- Simple-Map

```rs use smap::Dict;

fn main() { let mut e2c = Dict::new(); e2c.add("a", "一隻"); e2c.add("dog", "狗"); e2c.add("cat", "貓"); e2c.add("chase", "追"); e2c.add("bite", "咬"); println!("{:?}", e2c.get("cat")); println!("{:?}", e2c.get("xxx")); assert!(e2c.get("cat") != None); assert!(e2c.get("xxx") == None); } ```

run:

$ cargo run Compiling smap1 v0.1.0 (D:\ccc\ccc109a\se\rust\se\use\smap1) Finished dev [unoptimized + debuginfo] target(s) in 2.91s Running `target\debug\smap1.exe` Some("貓") None