swift.md

+# Swift
+
+https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/index.html#//apple_ref/doc/uid/TP40014097-CH3-ID0
+
+https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/GuidedTour.html#//apple_ref/doc/uid/TP40014097-CH2-ID1
+
+https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-ID309
+
+https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html
+
+
+## You should do the following:
+1. Create a branch from develop called feature/swift.
+2. Read about what is Swift, how it is used and how to use it with Objective-C.
+3. Add “Edit” button as a left navigation bar button item of `MasterViewController`.
+4. Create `OrganizationInfoViewController` in Swift, which is shown by tapping “Edit” button.
+5. Add “organization” property to the controller, which should be somehow obtained.
+6. Add “Calculate salary sum” button to the controller, which calculates the sum of salaries of all employees of the organization and outputs it in `UIAlertController` with a single “OK” button. This value should be stored in an optional variable called “salarySum”.
+7. Create a pull request from your branch to develop.
+
+
+## You should be able to answer the following questions:
+* What is Swift?
+* What is Swift’s current version?
+* What is the difference between class, struct and enum?
+* What are access controls in Swift?
+* What are optionals? How can they be unwrapped?
+* What is bridging header?
+* How do Swift and Objective-C work together in a single project?
+* What is `UIAlertController`?