doc: add OSE stat roll down the line

01.workspace/oxidice_lib/examples/roll_ose_stats.rs

@@ -0,0 +1,16 @@
+use oxidice_lib::dice::*;
+
+fn main() {
+    let str = Handful::grab(3, 6).roll().sum().unwrap();
+    let int = Handful::grab(3, 6).roll().sum().unwrap();
+    let wis = Handful::grab(3, 6).roll().sum().unwrap();
+    let dex = Handful::grab(3, 6).roll().sum().unwrap();
+    let con = Handful::grab(3, 6).roll().sum().unwrap();
+    let cha = Handful::grab(3, 6).roll().sum().unwrap();
+    println!("STR: {}", str);
+    println!("INT: {}", int);
+    println!("WIS: {}", wis);
+    println!("DEX: {}", dex);
+    println!("CON: {}", con);
+    println!("CHA: {}", cha);
+}