Adding installation guidelines for macos

[leland45]

Thanks for your incredible work on pyBar. As a mac user, I suggest to add installation guidelines for macos in the INSTALL.txt file. Here is a suggestion, which worked for me (macbook air m1, macOS ventura 13.6.9)

How to install pyBar on macos ??

I) prepare the python environment on mac
a) install homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

b) Install Python 3, Pip
brew install python
python3 --version #check python3 install
pip3 --version #check pip3 install. If missing : python3 -m ensurepip --upgrade

c) Install dependencies (PyGObject for Modern GTK+ 3 and numpy)
brew install pygobject3
pip3 install PyGObject

pip3 install numpy

II) Download and tweak pyBar files
a) Download pyBar sources from http://pybar.fr/download.html
b) unzip pyBar.zip in /Applications folder -> there is now a pyBar3.4 folder in /Applications
c) open the file pyBar with a text editor, and modify command /usr/bin/python3 $BASEDIR/pyBar.py to use the desired version of python (for which you installed dependencies)
d) double-click on the file pyBar to launch pyBar. You can also create an alias