feat: add tutorial of module

Author: MikhailMasny

index.html

@@ -28,5 +28,6 @@
     <!-- <script src="src/fetch.js"></script> -->
     <!-- <script src="src/spread.js"></script> -->
     <!-- <script src="src/destructor.js"></script> -->
+    <!-- <script src="src/module.js"></script> -->
 </body>
 </html>

src/module.js

@@ -0,0 +1,38 @@
+// This is export of variable.
+export let one = 1;
+
+// This is export of variables.
+let two = 2;
+let three = 3;
+export { two, three }
+
+// This is export of class.
+export class SomeClass {
+    constructor(someProp) {
+        this.someProp = someProp;
+    }
+}
+
+// This is export of class.
+export function someFunc() {
+    console.log("Some text");
+}
+
+// This is export of class or function in the end of file.
+// export { SomeClass, someFunc }
+// export { SomeClass as MyClass, someFunc as myFunc }
+
+// This is import of class or function in the end of file.
+// import { SomeClass, someFunc } from "./file.js"
+// import { SomeClass as MyClass, someFunc as myFunc } from "./file.js"
+// import * as SomeObjects from "./file.js"
+
+// This is export of default class.
+export default class NewClass {
+    constructor(someProp) {
+        this.someProp = someProp;
+    }
+}
+
+// This is import of default class.
+// import NewClass from "./file.js";