added sample.txt file for my word frequency code as well as a README

Author: Chloe White

word_frequency/README.md

@@ -0,0 +1,11 @@
+from collections import Counter
+
+def count_words(filename):
+    with open(filename, "r", encoding="utf-8") as f:
+        text = f.read().lower().split()
+    word_counts = Counter(text)
+    for word, count in word_counts.most_common(10):
+        print(f"{word}: {count}")
+
+if __name__ == "__main__":
+    count_words("counter_sample.txt")