add install script for ubuntu

[ltdrdata]

[yoland68]

This is to address the installer script task, right? We should try to have a universal script for all UNIX systems and one for PS1/BAT. E.g. https://raw.githubusercontent.com/richinsley/comfycli/main/install_scripts/installer.sh https://github.com/mamba-org/micromamba-releases

[yoland68]

Also, we should check if python/git/venv/conda are installed, but avoid helping users to install them. Or else we are putting too much burden to making sure python/venv/conda is installed correctly)

Which in this case, we can also get rid of using apt-get or yum for different distros