ReadMe file updated

Author: jayaleshwari

README.md

@@ -1,2 +1,50 @@
-# editable-drop-down-dataform-xamarin
-How to make editable drop down in Xamarin.Forms DataForm (SfDataForm)
+# How to make editable drop down in Xamarin.Forms DataForm (SfDataForm)
+
+You can make the editable drop down in Xamarin.Forms SfDataForm by using custom editor.
+
+You can create and add custom editor to SfDataForm by overriding the DataFormEditor class, where the CustomDropDownEditor is inherited using the DataFormDropDownEditor .
+
+Refer to the online user guide documentation for creating new custom editor in DataForm.
+
+**C#**
+
+DropDownEditor modified by customizing DataFormDropDownEditor.
+
+``` c#
+public class CustomDropDownEditor : DataFormDropDownEditor
+{
+    public CustomDropDownEditor(SfDataForm dataForm) : base(dataForm)
+    {
+    }
+    protected override void OnInitializeView(DataFormItem dataFormItem, SfComboBox view)
+    {
+        base.OnInitializeView(dataFormItem, view);
+        view.IsEditableMode = true;
+    }
+}
+```
+Refer to the following code example for binding DataObject and register the editor using RegisterEditor as CustomDropDownEditor to make data form items as custom editor in DataForm.
+
+**C#**
+
+DropDown editor registered to DataForm.
+``` c#
+namespace DataFormDropDown
+{
+    public class DataFormBehavior : Behavior<ContentPage>
+    {
+        SfDataForm dataForm;
+        protected override void OnAttachedTo(ContentPage bindable)
+        {
+            base.OnAttachedTo(bindable);
+            dataForm = bindable.FindByName<SfDataForm>("dataForm");
+            dataForm.DataObject = new Address();
+            dataForm.RegisterEditor("DropDown", new CustomDropDownEditor(dataForm));
+            dataForm.RegisterEditor("Country", "DropDown");
+        }
+    }
+}
+```
+**Output**
+
+![EditableDropDown](https://github.com/SyncfusionExamples/editable-drop-down-dataform-xamarin/blob/master/ScreenShots/EditableDropDown.png)