docs(readme): Start adding documentation for React version

docs/v1/lesion-tracker/user-preferences.md

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+# Lesion Tracker - User Preferences
+To view User Preferences dialog, select **Preferences** on the Configuration menu. User Preferences dialog includes a couple of tabs:
+
+![Configuration Menu](../assets/img/LesionTracker/LT_Configuration_Menu.png)
+
+#### Keyboard Shortcuts
+There are a number of default shortcuts for the defined tools. To change the shortcut for the tool, type the desired key into the tool field.
+
+![Keyboard Shortcuts](../assets/img/LesionTracker/LT_Keyboard_Shortcuts.png)
+
+#### Window Width & Level Presets
+There are a number of default Window Width/Level settings in the Window W/L tab. To create a new setting, enter the desired column field.
+
+![Window W/L](../assets/img/LesionTracker/LT_WL_Presets.png)
+
+## Color Themes
+
+1. To modify the colors in the viewer, select **Themes** from Configuration menu.
+2. Select a theme then click **Apply theme** to change the theme.
+
+![Themes](../assets/img/LesionTracker/LT_Themes.png)