docs: add DIRECTORY.md (#27)

Co-authored-by: Dimitri LESNOFF <dimitri.lesnoff@lip6.fr>

Author: dlesnoff

DIRECTORY.md

@@ -0,0 +1,10 @@
+<!--- DO NOT EDIT: This file is automatically generated by `directory.nim` -->
+
+# The Algorithms — Nim: Directory Hierarchy
+
+## Dynamic Programming
+  * [Catalan Numbers](dynamic_programming/catalan_numbers.nim)
+  * [Viterbi](dynamic_programming/viterbi.nim)
+
+## Strings
+  * [Check Anagram](strings/check_anagram.nim)