Create Upgrading-Cacti-Under-Windows.md

[robcmo]

The current published documentation does not include upgrade information for Windows. I propose this documentation as a separate file from Upgrading-Cacti.md, but it could also be added or combined with that file.

I have created instructions loosely based on the current Upgrading-Cacti.md file and the legacy Windows page from version 0.88. https://docs.cacti.net/manual:088:1_installation.3_upgrading#windows

[netniV]

So Travis is show a few outstanding issues still. If you are using an editor with line wrapping, try to set that to 79 columns to ensure it does wrap around to resolve the MD013. For nano this would be:

nano -r 80 <filename>

However, nano does like to leave a trailing whitespace when it moves a word to the next line, which introduces MD009, so you will need to remove that whitespace.

Additionally, you've used code blocks (three `'s) but you need to have a blank line before and after these to prevent seeing the MD031 error.

And finally, you need to insert a link to this new page into the README.md which provides the Table of Contents.

[jpobeda]

Don't know if there is an easy way of getting nano on a windows desktop but it may worth trying vim version for Windows since I think notepad++ (best editor for windows) doesn't give you any tools or plugin to justify text.

[cigamit]

I'll fix these after merging them.