add new constants

src/constants/calendar-options.js

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+const calendarOptions = {
+    ICAL: 'iCal',
+    GOOGLE: 'Google',
+    OUTLOOK: 'Outlook',
+    OUTLOOKCOM: 'Outlook.com',
+    YAHOO: 'Yahoo'
+};
+export default { calendarOptions };

src/constants/calendar-status.js

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+const calendarStatus = {
+    FREE: 'Free',
+    BUSY: 'Busy',
+    TENTATIVE: 'Tentative',
+    OUT_OF_THE_OFFICE: 'OutOfTheOffice'
+};
+export default { calendarStatus };

src/constants/service-type.js

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+const serviceType = {
+    REPLACEMENT: 'replacement',
+    REPAIR: 'repair',
+    REPLACEMENT_AND_RECALIBRATION: 'replacement and recalibration'
+};
+export default { serviceType };