ENH: Add install line to README

[linwoodc3]

@petercerno :

Recommend adding this instruction to the home page so people can install (assuming this will not be listed in PyPi):

---

Installation

To install good-morning using pip, open a terminal and type:

pip install git+https://github.com/petercerno/good-morning.git 

---

Based on my pull request #4 which you merged in, you could follow the instructions from this page to get this registered on pypi and installable via pip install good-morning.

Just wanted to make the suggestion. By the stars, you see a lot of people are using this library; they like your work!!

[petercerno]

Thanks for great suggestion! I am quite busy these days (traveling a lot etc), but I will do it as soon as I find some time. Cheers, Peter

As a suggestion, using Pipenv, one can also do:

pipenv install git+https://github.com/petercerno/good-morning.git#egg=good-morning