chore: import upstream snapshot with attribution

defaultmodules/helloworld/README.md

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+# Module: Hello World
+
+The `helloworld` module is one of the default modules of the MagicMirror². It is a simple way to display a static text on the mirror.
+
+For configuration options, please check the [MagicMirror² documentation](https://docs.magicmirror.builders/modules/helloworld.html).

defaultmodules/helloworld/helloworld.js

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+Module.register("helloworld", {
+	// Default module config.
+	defaults: {
+		text: "Hello World!"
+	},
+
+	getTemplate () {
+		return "helloworld.njk";
+	},
+
+	getTemplateData () {
+		return this.config;
+	}
+});

defaultmodules/helloworld/helloworld.njk

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+<!--
+	Use ` | safe` to allow html tags within the text string.
+	https://mozilla.github.io/nunjucks/templating.html#autoescaping
+-->
+<div>{{ text | safe }}</div>