Create README.md

Author: raghavs046

Client-Side Components/Client Scripts/Health Scan Prevent Insert Update in Before BRs/README.md

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+**Client script Deatils**
+1. Table: sys_script
+2. Type: onSubmit
+3. UI Type: Desktop
+
+**Benefits**
+1. This client script will prevent admin users to do insert/update operation in  onBefore business rules.
+2. It will help to avoid HealthScan findings thus increasing healthscan score.
+3. Will prevent recursive calls.
+
+Link to ServiceNow Business Rules best Practise : https://developer.servicenow.com/dev.do#!/guide/orlando/now-platform/tpb-guide/business_rules_technical_best_practices