Add Elixir examples for recursion

03_recursion/elixir/02_greet.exs

@@ -0,0 +1,18 @@
+defmodule Greeting do
+  def greet2(name) do
+    IO.puts("how are you, #{name}?")
+  end
+
+  def bye do
+    IO.puts("ok bye!")
+  end
+
+  def greet(name) do
+    IO.puts("hello, #{name}!")
+    greet2(name)
+    IO.puts("getting ready to say bye...")
+    bye()
+  end
+end
+
+Greeting.greet("adit")