add hello world properly, add rna-transcription (elixir is neat!)

elixir/rna-transcription/test/rna_transcription_test.exs

@@ -0,0 +1,28 @@
+defmodule RnaTranscriptionTest do
+  use ExUnit.Case
+
+  @tag :pending
+  test "transcribes guanine to cytosine" do
+    assert RnaTranscription.to_rna('G') == 'C'
+  end
+
+  @tag :pending
+  test "transcribes cytosine to guanine" do
+    assert RnaTranscription.to_rna('C') == 'G'
+  end
+
+  @tag :pending
+  test "transcribes thymidine to adenine" do
+    assert RnaTranscription.to_rna('T') == 'A'
+  end
+
+  @tag :pending
+  test "transcribes adenine to uracil" do
+    assert RnaTranscription.to_rna('A') == 'U'
+  end
+
+  @tag :pending
+  test "it transcribes all dna nucleotides to rna equivalents" do
+    assert RnaTranscription.to_rna('ACGTGGTCTTAA') == 'UGCACCAGAAUU'
+  end
+end