Adding new RichTextEditor mxml

...uebutton/modules/sharednotes/views/SharedNotesWindow.mxml

...arednotes/views/components/SharedNotesRichTextEditor.mxml

.../sharednotes/views/components/assets/divider_vertical.png

...sharednotes/views/components/assets/icon_align_center.png

...harednotes/views/components/assets/icon_align_justify.png

...s/sharednotes/views/components/assets/icon_align_left.png

.../sharednotes/views/components/assets/icon_align_right.png

...dules/sharednotes/views/components/assets/icon_bullet.png

...s/sharednotes/views/components/assets/icon_style_bold.png

...sharednotes/views/components/assets/icon_style_italic.png

...rednotes/views/components/assets/icon_style_underline.png