doc: add OSE stats example

01.workspace/oxydice_lib/examples/roll_ose_stats.rs

@@ -0,0 +1,17 @@
+use oxydice_lib::dice::*;
+
+fn main() -> Result<(), FailedTo>{
+    let str = Dice::grab(3, 6).roll().sum()?;
+    let int = Dice::grab(3, 6).roll().sum()?;
+    let wis = Dice::grab(3, 6).roll().sum()?;
+    let dex = Dice::grab(3, 6).roll().sum()?;
+    let con = Dice::grab(3, 6).roll().sum()?;
+    let cha = Dice::grab(3, 6).roll().sum()?;
+    println!("STR: {str}");
+    println!("INT: {int}");
+    println!("WIS: {wis}");
+    println!("DEX: {dex}");
+    println!("CON: {con}");
+    println!("CHA: {cha}");
+    Ok(())
+}

01.workspace/oxydice_lib/src/imp/sum_display.rs

@@ -9,7 +9,7 @@ impl fmt::Display for Sum {
             .map(|o| o.unwrap_or(0))
             .map(|r| r.to_string())
             .collect();
-        write!(f, "{}", format!("[{}]", str_results.join(", ")))?;
+        write!(f, "[{}]", str_results.join(", "))?;
         write!(f, " -> ")?;
         write!(f, "{}", self.sum)?;
         Ok(())

01.workspace/oxydice_lib/src/lib.rs

@@ -17,4 +17,5 @@ pub(crate) use crate::str::sum::O as Sum;
 pub mod dice {
     pub use crate::str::dice::O as Dice;
     pub use crate::str::sum::O as Sum;
+    pub use crate::str::failed_to::E as FailedTo;
 }