contains two files: main.py - works with subprocess, index.py - works with threading
Subprocess - Creates a file. Writes a list of all installed packages to the file (subprocrss.Popen()).
Searches the list of installed packages from the list (['git', 'python', 'apt', 'gzip', 'another']). Outputs the result to the terminal.
Threading - containts way of starting multiple threads: sync and async