TedOS is an operating system, or more specifically a kernel, that only implements a Vim-like text editor.
The simplest way to run the OS is by using the emulator QEMU. If you haven't already, install QEMU by running the following command:
sudo apt-get install qemu-system
This command will install the QEMU-system package using Aptitude. Then run make debug to build the kernel and launch the emulator.
You can also build the kernel using make kernel, which you can then boot using your preferred method.