Add slider info in Common Properties docs

Signed-off-by: srikant <[email protected]>

docs/3.3-Common-Properties-Controls.md

@@ -75,6 +75,7 @@ The following controls are supported in the Common Properties editor. Control ty
 * `structureeditor` Allows one to define a structure and use it directly on a panel. Each structure member is surfaced as an individual control. Supports a `layout` setting that allows one to position structureeditor controls in a grid (see below).
 * `readonlyTable` A read only table. Used for tables to display fields that users shouldn't edit.
 * `custom` A custom control for displaying a user defined control. See [3.5 Common Properties Custom Components](3.5-Common-Properties-Custom-Components.md#custom-controls) for more details.
+* `slider` A standard slider which allows to enter a numeric value within the slider range and also allows to drag and adjust the slider track to a specific value within the range. The slider labels for minimum and maximum values can be customized by setting them as `[parameter_id].min.label`   for minimum value label and `[parameter_id].max.label` for maximum value label in resources section.
 
 
 ### A Note on Field Name Storage