add: if statement exercises

11-if/exercises/07-leap-year/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Leap Year
+//
+//  Find out whether a given year is a leap year or not.
+//
+// EXPECTED OUTPUT
+//  go run main.go
+//    Give me a year number
+//
+//  go run main.go eighties
+//    "eighties" is not a valid year.
+//
+//  go run main.go 2018
+//    2018 is not a leap year.
+//
+//  go run main.go 2019
+//    2019 is not a leap year.
+//
+//  go run main.go 2020
+//    2020 is a leap year.
+//
+//  go run main.go 2024
+//    2024 is a leap year.
+// ---------------------------------------------------------
+
+func main() {
+}