Update users_comments.md

Author: AtsushiSakai

users_comments.md

@@ -214,6 +214,11 @@ Thank You
 
 --Anonymous
 
+---
+
+I've learned the robotics from the traditional way of solving problem through finding packages and reading papers. This amazing project is unbelievably helpful for new-comers to learn and get familiar with the algorithms. Gods know how many hours you've taken to sort all the materials and written everything into one single coherent project. I'm truly amazed and deepest appreciation.
+
+--Ewing Kang
 
 
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