Update README.md

Author: astomodynamics

README.md

@@ -1,17 +1,13 @@
 # Constrained Differential Dynamic Programming (CDDP) solver in C++
+```
 +---------------------------------------------------------+
-
 |    ____ ____  ____  ____    _          ____             |
-
 |   / ___|  _ \|  _ \|  _ \  (_)_ __    / ___| _     _    |
-
 |  | |   | | | | | | | |_) | | | '_ \  | |   _| |_ _| |_  |
-
 |  | |___| |_| | |_| |  __/  | | | | | | |__|_   _|_   _| |
-
 |   \____|____/|____/|_|     |_|_| |_|  \____||_|   |_|   |
-
 +---------------------------------------------------------+
+```
 
 **This library is actively under construction.** Please wait for proper release after starring this repo :star:
 Also, I am writing this library for practical experience with C++. Any suggestions are helpful to me.