Update and rename readme.md to readme.md

Moved the readme and made the text more descriptive. Included a description of what the validation actually does.

Author: WillemZeiler

Client-Side Components/Client Scripts/Allow positive and decimal values/readme.md

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+## Numeric Field Validation Script
+
+This script validates numeric input in a form. It is used to ensure that values entered in fields like amount or price are properly formatted.
+
+### Validation Rules
+
+- Only positive numbers are allowed  
+- Decimals are allowed, up to two digits  
+- Zero or negative values are not accepted  
+- Invalid input will clear the field and show an error message