📝 [README]

Author: enkr1

README.md

@@ -2,24 +2,27 @@
 
 1. [Two Sum](./1/)
 2. [Add Two Numbers](./2/)
-3. -
+3. [Longest Substring Without Repeating Characters](./3/)
 4. -
 5. [Longest Palindromic Substring](./5/)
 
 ---
-solution.js -- The solution I submitted.
-my_solution.js -- My attemp.
-o_solution.js -- Online/others' solution, not by me.
+
+> solution.js - The solution I submitted
+> my_solution.js - My attemp with logs and comments
+> o_solution.js - Online/others' solutions
 
 ---
-## Run for JS
+## Commands for myself
+
+Run for JS
 ```sh
 node ./.../solution.js
 ```
 
 ---
 
-## Run for Elixir
+Run for Elixir
 ```sh
 iex ./.../solution.ex
 ```