I found a solution to add this superb wifi adapter:

Create an account at GitHub. Then from a terminal execute the following:

sudo dnf install git dkms
git clone https://github.com/zebulon2/rtl8814au.git (might will ask for username and password).
sudo dkms add ./rtl8814au
sudo dkms build -m rtl8814au -v 4.3.21
sudo dkms install -m rtl8814au -v 4.3.21