[Suggestion] Add info about external storage access on Termux tab

Hello, i'd like to say that you can actually access your external storage on Termux without any need of root access, and then on copyparty just fine, and it would be super cool if there was proper information for that on the Termux section :3

1 - Install Termux and copyparty like it is intended to do
2 - Open Termux's app settings and enable All files permission
3 - Find the current directory your external USB drive is in. For that, you can use Zarchiver, which will show exactly how it is.
4 - Create a symlink from your external drive to the ~/storage/ directory, which is where Termux can access it, and so does copyparty: `ln -sf /directory/of/drive/ ~/storage/whatever-name-you-want`
5 - Analyze the external drivers that are being connected with `termux-usb -l`
6 - Authorize its access with `termux-usb -r /drive/directory/from/before/`
5 - Start copyparty :D