Add rna-transcription issue

source/rna_transcription.yml

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+---
+level: easy
+tags: [strings]
+description: |
+  Write a program that, given a DNA strand, returns its RNA complement (per RNA transcription).
+  Both DNA and RNA strands are a sequence of nucleotides.
+  The four nucleotides found in DNA are adenine (A), cytosine (C), guanine (G) and thymidine (T).
+  The four nucleotides found in RNA are adenine (A), cytosine (C), guanine (G) and uracil (U).
+  Given a DNA strand, its transcribed RNA strand is formed by replacing each nucleotide with its complement:
+    G -> C
+    C -> G
+    T -> A
+    A -> U
+multicode_checks:
+  langs: [ruby, javascript, python, php]

test/battle_solutions/rna_transcription_test.clj

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+(ns battle-solutions.rna-transcription-test
+  (:require [clojure.test :refer :all]
+            [battle-asserts.test-helper :refer [assert-equal]]))
+
+(defn to-rna
+  [dna]
+  (let [transcription {\C \G
+                       \G \C
+                       \A \U
+                       \T \A}]
+    (apply str
+           (map #(transcription %) dna))))
+
+(deftest test-asserts
+  (assert-equal "G" (to-rna "C"))
+  (assert-equal "C" (to-rna "G"))
+  (assert-equal "U" (to-rna "A"))
+  (assert-equal "UGCACCAGAAUU" (to-rna "ACGTGGTCTTAA")))