Create README.md

Author: raghavs046

Modern Development/Add Multiple Catalogs to Order Guide/README.md

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+**Details**
+1. This code will add multiple items in an order guide in single click
+2. Order guide rule base creation will be automatic
+3. This code will also add variable set to selected catalog items automatically.
+
+**How to use**
+1. Go to "sc_cat_item" table and select the items to be added in list view.
+2. Look for "Add to order guide" in list actions.
+3. The list action will give you an option to select order guide and variable set to be added to catalog items
+
+**Components**
+1. UI Action
+2. UI Page
+3. Script Include
+
+<img width="3442" height="1502" alt="image" src="https://github.com/user-attachments/assets/823efffa-1285-488e-a4a6-ae0e6377001f" />