add: if statement exercises

11-if/exercises/04-vowel-or-cons/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: Vowel or Consonant
+//
+//  Detect whether a letter is vowel or consonant.
+//
+// NOTE
+//  y or w is called a semi-vowel.
+//  Check out: https://en.oxforddictionaries.com/explore/is-the-letter-y-a-vowel-or-a-consonant/
+//
+// HINT
+//  + You can find the length of an argument using the len function.
+//
+//  + len(os.Args[1]) will give you the length of the 1st argument.
+//
+// BONUS
+//  Use strings.IndexAny function to detect the vowels.
+//  Search on Google for: golang pkg strings IndexAny
+//
+// EXPECTED OUTPUT
+//  go run main.go
+//    Give me a letter
+//
+//  go run main.go hey
+//    Give me a letter
+//
+//  go run main.go a
+//    "a" is a vowel.
+//
+//  go run main.go y
+//    "y" is sometimes a vowel, sometimes not.
+//
+//  go run main.go w
+//    "w" is sometimes a vowel, sometimes not.
+//
+//  go run main.go x
+//    "x" is a consonant.
+// ---------------------------------------------------------
+
+func main() {
+}