doc: Update

README.md

@@ -9,12 +9,12 @@
 
 Types include [Result](https://mcmah309.github.io/rust/libs/result/result.html), [Option](https://mcmah309.github.io/rust/libs/option/option.html), [Cell](https://mcmah309.github.io/rust/libs/cell/cell.html), [Slice](https://mcmah309.github.io/rust/libs/slice/slice.html), [Array](https://mcmah309.github.io/rust/libs/array/array.html), [Iterator](https://mcmah309.github.io/rust/libs/iter/iter.html), [Channels](https://mcmah309.github.io/rust/libs/sync/channels.html), [Mutex](https://mcmah309.github.io/rust/libs/sync/mutex.html), [Path](https://mcmah309.github.io/rust/libs/path/path.html) and more.
 
-See the [Book 📖](https://mcmah309.github.io/rust) for more!
+See the [Documentation Book 📖](https://mcmah309.github.io/rust) for more!
 
-## Example
+## Rust Language vs rust Package Example
 > Goal: Get the index of every "!" in a string not followed by a "?"
 
-**Rust:**
+**[Rust](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=6010cc86519e58e4592247403830cde7):**
 ```rust
 use std::iter::Peekable;
 

example/main.dart

@@ -3,6 +3,7 @@
 import 'package:rust/rust.dart';
 
 void main() {
+  readmeExample();
   usingTheEarlyReturnKeyExample();
   usingRegularPatternMatchingExample();
   usingFunctionChainingExample();
@@ -12,6 +13,32 @@ void main() {
   /// Visit the book to see more!
 }
 
+void readmeExample() {
+  final string = "kl!sd!?!";
+  Vec<int> answer = [];
+  Peekable<(int, Arr<String>)> iter = string
+      .chars()
+      .mapWindows(2, identity)
+      .enumerate()
+      .peekable();
+
+  while (iter.moveNext()) {
+    final (index, window) = iter.current;
+    switch (window) {
+      case ["!", "?"]:
+        break;
+      case ["!", _]:
+        answer.push(index);
+      case [_, "!"] when iter.peek().isNone():
+        answer.push(index + 1);
+    }
+  }
+  assert(answer.length == 2);
+  assert(answer[0] == 2);
+  assert(answer[1] == 7);
+}
+
+
 Result<int, String> usingTheEarlyReturnKeyExample() => Result(($) {
       // Early Return Key
       // Will return here with 'Err("error")'