Merge pull request vsouza#2685 from chaselen/master

Add FSCalendar

README.md

@@ -2305,6 +2305,7 @@ Most of these are paid services, some have free tiers.
 * [KDCalendarView](https://github.com/mmick66/CalendarView) - A calendar component for iOS written in Swift 4.0. It features both vertical and horizontal layout (and scrolling) and the display of native calendar events.
 * [CalendarPopUp](https://github.com/orazz/CalendarPopUp) - CalendarPopUp - JTAppleCalendar library.
 * [ios_calendar](https://github.com/maximbilan/Calendar-iOS)  - It's lightweight and simple control with supporting Locale and CalendarIdentifier. There're samples for iPhone and iPad, and also with using a popover. With supporting Persian calendar
+* [FSCalendar](https://github.com/WenchaoD/FSCalendar) - A fully customizable iOS calendar library, compatible with Objective-C and Swift.
 
 ### Cards