Update Help

Help.md

@@ -31,6 +31,17 @@ Bouquin supports various keyboard shortcuts:
 - **Ctrl+N**: Set selected text to normal size (paragraph)
 - **Ctrl+`**: Set selected text to be in a ```<code>``` block
 
+#### Images
+
+It is possible to click the 'Image' button to add an image.
+
+To resize the image, right-click on the image and choose from the 'Image size' options. These include:
+
+ * Shrink by 10%
+ * Grow by 10%
+ * Fit to editor width
+ * Set width (manually)
+ * Reset to original
 
 ## Navigating by date