readme additions (#792)

Author: Langston Smith

README.md

@@ -18,6 +18,10 @@ Plugins are single-purpose libraries built on top of the [Mapbox Maps SDK for An
 
 ## Available Plugins
 
+* [**Annotation:** Simplify the way to set and adjust the visual properties of annotations on a Mapbox map.](https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-markerview)
+
+* [**MarkerView:** Add map markers that are Android views.](https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-annotation)
+ 
 * [**Traffic:** Adds a real-time traffic layer to any Mapbox base map.](https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-traffic)
 
 * [**Location layer:** Add a location marker on your map indicating the user's location.](https://github.com/mapbox/mapbox-plugins-android/tree/master/plugin-locationlayer)

plugin-markerview/README.md

@@ -4,7 +4,11 @@
 
 ## Getting Started
 
-To use the MarkerView plugin you include it in your `build.gradle` file.
+[More documentation about the plugin can be found here](https://www.mapbox.com/android-docs/plugins/overview/markerview/).
+
+Please be aware that Android views are the less performant and less customizable option for adding icons to a map. The Mapbox Maps SDK's SymbolLayer is the recommended way to add icons. View [the Mapbox Annotation Plugin for Android](https://www.mapbox.com/android-docs/plugins/overview/annotation) for more information about using a SymbolLayer.
+
+To use the MarkerView plugin, you include its dependency in your `build.gradle` file.
 
 ```
 // In the root build.gradle file