README: install minipro the debian way #17

Note:
The minipro package is not available in most distributions by default.
You can install it manually by cloning and building from source:

git clone https://gitlab.com/DavidGriffith/minipro.git
cd minipro
make
sudo make install

HINT: minipro has a working deb build setup:

git clone https://gitlab.com/DavidGriffith/minipro.git
cd minipro
make deb
sudo apt install $(ls ../minipro_*.deb | tail -1)

This will install the latest version of minipro (in case you built also previous versions).