📖 [Docs]: Update README to include links for installing popular fonts (#39)

## Description

This pull request includes a minor update to the `README.md` file to
provide additional information about related modules for installing
popular fonts.

Documentation update:

*
[`README.md`](diffhunk://#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R6-R8):
Added references to the `NerdFonts` and `GoogleFonts` modules for users
looking to install popular fonts on their system.

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] 📖 [Docs]
- [ ] 🪲 [Fix]
- [ ] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

README.md

@@ -3,6 +3,9 @@
 This is a PowerShell module for managing fonts.
 It helps you to install, uninstall and list fonts on the system.
 
+This module only provides the functionality to manage fonts on the system. To install popular fonts on the system,
+please review the [NerdFonts](https://github.com/PSModule/NerdFonts) and [GoogleFonts](https://github.com/PSModule/GoogleFonts) modules.
+
 ## Supported platforms
 
 This module supports managing fonts on Linux, macOS and Windows operating systems.