This plugin gives you a 1 page note for the administrator.

Author:Robert Murdock (profile at wordpress.org)
WordPress version required:2.8
WordPress version tested:3.6.1
Plugin version:1.1
Added to WordPress repository:17-08-2013
Last updated:18-09-2013
Warning! This plugin has not been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Rating, %:80
Rated by:1
Plugin URI:http://wordpress.org/extend/plugins/wp1Note/
Total downloads:518
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This plugin gives the administrator a one page note to save notes for the site. For instance, I keep track of custom colors used on my sites and make quick little to-do lists. You can keep track of code snipits as well.

You can also set permission to edit/view contents in the editor with respect to logged user role.

Supports multiple languages.