Create codespell.yml (#1698)

* fixup! Format Python code with psf/black push

* Create codespell.yml

* fixup! Format Python code with psf/black push

compression/huffman.py

@@ -21,7 +21,7 @@ class TreeNode:
 def parse_file(file_path):
     """
     Read the file and build a dict of all letters and their
-    frequences, then convert the dict into a list of Letters.
+    frequencies, then convert the dict into a list of Letters.
     """
     chars = {}
     with open(file_path) as f: