add pip from python install code example

Example 1: python pip install

## To install Pip, first download get-pip.py from:
https://bootstrap.pypa.io/get-pip.py
  
## Then run the following command in the command line
## in the folder where the file has been saved.
python get-pip.py

Example 2: how to download packages using pip

pip install package name

Example 3: how to install python libraries using pip

pip install package name