Currency formatter (ServiceNowDevProgram#869)

* Create currencyFormatting.js

2 examples how can you format currencies for different locales and different formats

* Create README.md

description how you can customize the format of your output

Author: almajam

Background Scripts/Currency Formatting/README.md

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+Format currency values to your preferred locale and format.
+Examples are provided for EUR, HUF with English and Hungarian number format.
+
+formatString values:
+    Valid values:
+    
+    %s: Replaced by the currency symbol associated with the country code specified in the format() call.
+    %v: Replaced by the currency amount, such as 123.45.
+    %c: Replaced by the ISO currency code specified in the format() call, such as USD or EUR.
+    %l: Replaced with the passed in value, no formatting performed.
+    %p: Replaced by the percent sign (%).
+    For example, if the format string is '%s%v%c' and the value to format is 123.45 in US dollars, the returned formatted string is $123.45 USD. If the format string is '%s%l%c' and the value string to format is '56M' in Euros, the returned formatted string is €56M EUR.
+
+setMaxFractionDigits:
+    Maximum number of fraction digits to return. Does a rounding based on the closest right-most digit.

Background Scripts/Currency Formatting/currencyFormatting.js

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+var amount = '9123456.123456789';
+var currencyCode = 'EUR';
+var formatString = '%s%v %c';
+var exchangeValue = new sn_currency.GlideCurrencyFormatter(formatString);
+exchangeValue.setLocale("en", "EN"); // Language = en Country = EN
+
+gs.info('Formatted currency: ' + exchangeValue.setMaxFractionDigits(1).format(amount, currencyCode));
+// expected output: Formatted currency: €9,123,456.1 EUR
+
+amount = '9123456.127456789';
+currencyCode = 'HUF';
+formatString = '%v %c';
+exchangeValue = new sn_currency.GlideCurrencyFormatter(formatString);
+exchangeValue.setLocale("hu", "HU"); // Language = hu Country = HU
+
+gs.info('Formatted currency: ' + exchangeValue.setMaxFractionDigits(2).format(amount, currencyCode));
+// expected output: Formatted currency: 9 123 456,13 HUF