Prototype: README and comments

Author: fadeevab

creational/prototype/README.md

@@ -0,0 +1,25 @@
+# Prototype
+
+_**Prototype** allows cloning objects, even complex ones, without coupling to their specific classes._
+
+**_Rust_** has standard `Clone` implementation (via `#[derive(Clone)]`) for many
+types which makes Prototype easy and seamless to use.
+
+```rust
+let mut circle2 = circle1.clone();
+```
+
+See **[The Easiest Patterns in Rust](https://fadeevab.com/the-easiest-patterns-in-rust/)**.
+
+## How to Execute
+
+```bash
+cargo run --bin prototype
+```
+
+## Output
+
+```
+Circle 1: 10, 15, 10
+Circle 2: 10, 15, 77
+```

creational/prototype/main.rs

@@ -12,6 +12,7 @@ fn main() {
         radius: 10,
     };
 
+    // Prototype in action.
     let mut circle2 = circle1.clone();
     circle2.radius = 77;