Update the readme files for the different projects

Author: subev

grid/ajax-editing-with-enumration/README.md

@@ -1 +1,2 @@
 # Ajax editing with enumeration
+This project demonstrates how to setup the Grid to handle the editing of Enum property.

grid/custom-row-styles-based-on-data/README.md

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+# Add custom styles to the row elements of the Grid based on the data model.
+This approach can be used in scenarios where the Grid rows should have different color or other classes/styles based on the different values shown inside the corresponding row.

grid/external-editing-container/README.md

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-#  External editor for batch editable grid #
+#  External editor for batch editable grid
+This approach can be used in sceanrios where the users want to select an item from the Grid and in separate element edit the properties of the selected model.

grid/grid-editing-cascading-dropdownlist/README.md

@@ -1 +1 @@
-#  The project demonstrates how to setup your Grid to handle cascading dropdownlists with popup or inline editing mode #
+#  The project demonstrates how to setup your Grid to handle cascading dropdownlists with popup or inline editing mode

grid/post-grid-selection-to-server/README.md

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+# Post grid selection to server
+This project shows how the users can post the items that were selected within the Grid with a form element.
+Useful in scenarios where users want to select several items from the Grid so they can be further processed on the server.