Add Windows installation instructions

[yantar92]

A user in reddit does not know how to install the branch on windows [1]. Need to add instructions for Windows users (no command line staff).

[1] https://old.reddit.com/r/orgmode/comments/k6f5fx/ann_experimental_orgmode_branch_improving/gfde0py/

[yantar92]

First draft (blind, I am not using Windows):

1. Go to https://github.com/yantar92/org

2. Download the branch (Green "Code" button -> "download ZIP")

3. Unpack the downloaded ZIP file

4. Find "lisp" folder inside the unpacked "org" folder. Note the path to the "lisp" folder

5. If you don't have init file, create/open it using C-x C-f ~/.emacs (or .emacs/init.el if you already have that)

6. Add (setq load-path (append '("the/path/you/just/noted") load-path)) to your Emacs init file (on top of the file). Important: The \ in the Windows path should be replaced with /.

7. Add (require 'org) in the next line

8. Save the file C-x C-s

9. Reload Emacs

10. Try to run M-x org-version. Tell me what is written at the bottom of the Emacs window.