Create README.md

Author: sorenoid

microapps/FeatureFormsApp/README.md

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+# FeatureForms Micro-app
+
+This micro-app demonstrates the use of the `FeatureForm` toolkit component which provides a rich, dynamic, and responsive form
+for editing Feature attributes.
+
+![Screenshot](screenshot.gif)
+
+## Usage
+
+The application provides a web map gallery and a map viewer which invokes the form when Features are tapped.
+Authentication is optional but limited to specific public web maps.
+
+To authenticate ArcGIS Online with username and password, please provide values in `local.properties` as follows
+
+```
+webMapUser=XXX
+webMapPassword=YYY
+```
+
+For more information on the `FeatureForm` component and how it works, see it's [Readme](../../toolkit/featureforms/README.md).