Use case of addOption() and removeOption() in onChange client script for priority field (#986)

* Create script.js

 addOption() and removeOption() in onChange client script for priority field

* Create readme.md

Author: chetnadev

Client Scripts/Use case of addOption() and removeOption()/readme.md

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+# onChange client script for table 'change_request' where field is 'priority'
+if priority is critical, impact can be high and medium i.e, low will be removed from choice list using removeOption()
+and for other priority ,impact can be high, medium and low i.e, low option will be added, using addOption()

Client Scripts/Use case of addOption() and removeOption()/script.js

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+   if (isLoading || newValue === '') {
+	return;
+   }
+   if(newValue == 1) {
+	g_form.removeOption('impact',3); // 3 is the value for impact 'low'
+   } else {
+	g_form.addOption('impact',3,'3 - Low');
+   }
+}