Update README.md
Added Relevant API section to readme
<h2>How to use the sample</h2>
-<p>Use the drop down menu to sketch points, multipoints, polygons, freehand lines and freehand polgons.</p>
+<p>Use the drop down menu to choose which graphic to sketch. Choose from points, multipoints, polygons, freehand lines and freehand polgons.</p>
-<p>Use the control panel to cancel, undo or redo changes made to the sketch and to save the sketch to the graphics overlay. There is also the option to select a graphic saved within the graphics overlay and edit its geometry. The graphics overlay can be cleared using the "Clear graphics overlay button".</p>
+<p>Use the control panel to cancel the sketch, undo or redo changes made to the sketch and to save the sketch to the graphics overlay. There is also the option to select a graphic saved within the graphics overlay and edit its geometry using the Sketch Editor. The graphics overlay can be cleared using the "Clear graphics overlay" button.</p>
<h2>How it works</h2>
<ol>
-<li></li>
+<li>Create a <code>SketchEditor</code> and add it to a <code>MapView</code>.</li>
-<li> </li>
+<li>Use <code>SketchEditor.start(<SketchCreationMode>)</code> to start sketching.</li>
+
+<li>Use <code>.undo()</code> and <code>.redo()</code> on your instance of sketch editor to undo and redo sketch events.</li>
+
+<li>Use </li>
-<li></li>
</ol>
-<h2></h2>
+<h2>Relevant API</h2>
<ul>
-<li></li>
-
-<li></li>
-<li></li>
+<li>Geometry</li>
+<li>Graphic</li>
+<li>GraphicsOverlay</li>
+<li>MapView</li>
+<li>SketchCreationMode</li>
+<li>SketchEditor</li>
</ul>
