Update README.md

Added some useful information.

README.md

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+# NiceColor.js
+Generate sleek, modern, nice colors with pure JS.
+
+## Get started
+Everything needed for NiceColor.js to work is included in the class, no dependencies.
+
+NiceColor.js comes in two versions; `NiceColor.js` as a stand-alone class, and `module/NiceColor.mjs` for use with [ECMAScript Modules](https://tc39.es/ecma262/#sec-modules).
+
+### As a class
+
+1. Copy the contents of `NiceColor.js` into your JS-file.
+2. Initialize and generate a color
+```javascript
+const niceColor = new NiceColor();
+niceColor.get(); // Returns HEX-color
+```
+
+### As a module
+
+1. Copy the file `module/NiceColor.mjs` into your JS module(s) folder
+2. Import `'NiceColor'` from your `type='module'` or Node.js script
+```javascript
+import { NiceColor } from "./<your-module-dir>/NiceColor.mjs";
+```
+3. Initialize and generate a color
+```javascript
+const niceColor = new NiceColor();
+niceColor.get(); // Returns HEX-color
+```
+
+## Additional Features:
+
+### Get RGB values directly (without #)
+
+The RGB HEX channels are initialized as an array `this.hex` of the class `NiceColor`. You need to generate a color before the values get populated
+```javascript
+this.hex = [
+   null, // Red
+   null, // Green
+   null // Blue
+];
+```
+
+Example after `generate()` has been run:
+```javascript
+this.hex = [
+   "FF", // Red
+   "16", // Green
+   "A2" // Blue
+];
+```
+
+Get the array with `this.hex` after you've generated a color with `get()` (or `generate()` if you don't care about the final HEX-code at all)
+
+Example:
+```javascript
+const niceColor = new NiceColor();
+niceColor.generate();
+
+console.log(niceColor.hex); // Logs: Array["FF,"16,"A2"]
+```