docs: Add more detail to code example

README.md

@@ -23,25 +23,34 @@ implementation "uk.co.probablyfine:femto:${version}"
 ## Usage 
 
 ```java
-// Initialise a new injector
-var injector = new FemtoInjector();
-
-// Bind to a class (searches for a valid constructor)
-injector.bind(One.class); 
-
-// Bind a class to an instance
-injector.bind(Two.class, new TwoImplementation()); 
-
-// Depends on One, Two
-injector.bind(Three.class); 
-
-// Create a new object
-Three three = injector.get(Three.class);
+class Example {
+
+    public static void main(String... args) {
+        // Initialise a new injector
+        var injector = new FemtoInjector();
+
+        // Bind a class
+        injector.bind(One.class); 
+
+        // Bind a class to an implementing class
+        injector.bind(Two.class, TwoImplementation.class); 
+
+        // Bind a class to an instance
+        injector.bindInstance(Three.class, new ThreeImplementation()); 
+
+        // Depends on One, Two, Three
+        injector.bind(Four.class); 
+
+        // Create a new object
+        Four four = injector.get(Four.class);
+    }
+}
 ```
 
 ## Design Decisions
 
 - **Singleton by default**: The first call to `FemtoInjector#get` caches the result for each class and returns the same value afterwards
 - **Lazy by default**: `FemtoInjector` does not initialise any classes until `.get()` is called.
 - **No annotation "magic"**: Clients register components directly with the injector rather than using JSR 330 (`@Inject`) annotations.
-- **Prefer standard Java over dependencies**: Keeps the library small, and the source code easy to read.
+- **Prefer standard Java over dependencies**: Keeps the library small, and the source code easy to read.
+- **No named bindings**: Usd the type system to extend and name classes instead.