Finish installation guide

[timskovjacobsen]

Guide needs to

• Be up-to-date for November 2019
• Include installation and setup for running code with editors VS Code and Spyder

[timskovjacobsen]

Installation guide is basically finished.

It currently covers:

• Installation of vanilla Python 3.7.5 (recommended)
• Installation via Miniconda (primarliy for people who want to use the Spyder editor)

Currently awaiting a possible COWI GAC installation solution, which would replace the recommended solution described.

• Some typos need to be fixed

[timskovjacobsen]

Now awaits the GAC COWI Python environment so that can replace the recommended installation.