BG for Week Calculation (#2458)

* Create script.js

* Delete Server-Side Components/Scheduled Jobs/Trigger Email and pass week parameter directory

* Create Calculate Week.js

* Delete Server-Side Components/Background Scripts/Calculate Week.js

* Create week_calculation.js

* Create Readme.md

Author: kishoretk92

Server-Side Components/Background Scripts/Calculate Week/Readme.md

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+This script determines the number of weeks between the start and end date
+Provide the date value in start start_date and end_date in the script to calculate number of weeks between 2 dates  

Server-Side Components/Background Scripts/Calculate Week/week_calculation.js

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+//Determines the number of weeks between the start and end dates
+var startDate = new GlideDateTime(<start_date>);
+var endDate = new GlideDateTime(<end_date>);
+
+var millisecondsBetween = endDate.getNumericValue() - startDate.getNumericValue();
+var weeks = millisecondsBetween / (1000 * 60 * 60 * 24 * 7);
+
+var weeks_roundoff =  Math.floor(weeks);
+
+gs.info(weeks_roundoff);