chore: add main page

Include the main page for ensuring all checks pass correctly. Will edit
this in the future.

src/pages/main-page.js

@@ -0,0 +1,12 @@
+'use strict'
+
+class MainPage {
+	constructor() {
+		this.element = document.createElement('div')
+	}
+	create() {
+		return this.element
+	}
+}
+
+export { MainPage }