updated readme

Author: nd9600

README.md

@@ -2,8 +2,10 @@
 My wiki
 
 ## Usage
+This converts all the Markdown files in `pages/` to HTML, and makes an index for them (in `index.html` for once), with an A-to-z list, a tag tree, and a search, all static.
 
 1. [Install Red](https://www.red-lang.org/p/download.html)
-2. `red generator.red` (change `'wikiLocation` in `generator.red` if you want)
+2. Copy `env.example` to .`env` and set `wikiLocation` in it to point to the foldre you want the HTML files to be added to (it will remove any existing `*.html` files in it)
+3. `red generator.red`
 
 The wiki will be where you want then :)