add a first try

python/word-count/word_count.py

@@ -1,2 +1,11 @@
-def count_words(sentence):
-    pass
+def count_words(input_sentence):
+    sentence = input_sentence.lower()
+    words = sentence.split()
+    result = {}
+    for word in words:
+        counter = 0
+        if word in words:
+            counter += 1
+        result[word] = counter
+
+    return result