Create readme.md

Author: kishoretk92

Client-Side Components/Catalog Client Script/Percentage Symbol/readme.md

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+Sets the field value to the formatted percentage string (e.g., 45 becomes 45.00%).
+
+Retrieves the current value of the field.
+Removes any existing % symbol to avoid duplication.
+Validates the input to ensure it's a number.
+Converts the value to a float.
+Formats it to two decimal places and appends a % symbol.