Add guidance on method binding for class components

STYLE.md

@@ -511,6 +511,48 @@ const propTypes = {
 }
 ```
 
+## Binding methods
+
+For class components, methods should be bound in the `constructor()` if passed directly as a prop or needing to be accessed via the component instance from outside of the component's execution context. Binding all methods in the constructor is unnecessary. Learn and understand how `this` works [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this).
+
+```javascript
+// Bad
+class SomeComponent {
+    constructor(props) {
+        super(props);
+
+        this.myMethod = this.myMethod.bind(this);
+    }
+
+    myMethod() {...}
+
+    render() {
+        return (
+            // No need to bind this since arrow function is used
+            <Button onPress={() => this.myMethod()} />
+        );
+    }
+}
+
+// Good
+class SomeComponent {
+    constructor(props) {
+        super(props);
+
+        this.myMethod = this.myMethod.bind(this);
+    }
+
+    myMethod() {...}
+
+    render() {
+        return (
+            // Passed directly to Button so this should be bound to the component
+            <Button onPress={this.myMethod} />
+        );
+    }
+}
+```
+
 ## Inline Ternarys
 * Use inline ternary statements when rendering optional pieces of templates. Notice the white space and formatting of the ternary.