How to add Georgian font on Illustrator

Are you asking how you add the Microsoft Georgia font family for use in Illustrator?

Or are you asking how you add fonts that support the Georgian language for use in Illustrator?

In the first case, if you are running under Windows, those fonts should already be installed and ready for use within any application you run on Windows including Adobe Illustrator. For MacOS, you may need to separately license such fonts and then install on your Mac using Fontbook.

In the second case, I assume you know of fonts that support the Georgian language. License and install such fonts on your computer, whether Windows or MacOS, and they will be available for use within Adobe Illustrator.