Create README.md

Author: anjimuvva

Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/README.md

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+Client Script: Make Subcategory Mandatory Based on Category
+
+Overview:
+This client script ensures that the Subcategory field becomes mandatory when a Category is selected on the Incident form.
+
+Implementation Details:
+
+Create a new Client Script with the following configuration:
+
+Type: OnChange
+Table: incident
+Field: category
+
+Add the provided script in the file mandatory_subcategory.js.