foreword: add notes on how to navigate the document

content/foreword.md

@@ -22,5 +22,16 @@ Jasper "cearn" Vijn is the original author, creating and maintaining Tonc till 2
 
 exelotl, avivace, PinoBatch, copyrat90, LunarLambda and gwilymk ported the contents to markdown and migrated the underlying rendering technology to mdbook.
 
+## Using this document
+
+In the top navigation bar, you will find a series of icons.
+
+By clicking on the <i class="fa fa-bars"></i> icon you will toggle an interactive table of contents to navigate the document. You can also use <kbd>→</kbd> and <kbd>←</kbd> keys on your keyboard to go to the following and previous page.
+
+The <i class="fa fa-paint-brush"></i> lets you choose among 5 different themes and color schemes to please your reading experience.
+
+You can search anywhere by pressing <kbd>s</kbd> on your keyboard or clicking the <i class="fa fa-search"></i> icon.
+
+The <i class="fa fa-edit"></i> icon allows you to suggest an edit on the current page by directly opening the source file in the git repository.
 
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