added main and defined M_PI

Dependencies:   BNOWrapper

Revision:
9:08937d4564e5
Child:
10:14374b492f1d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BNOWrapper.lib	Wed Aug 07 17:26:41 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/Affordable-Smart-Wheelchair/code/BNOWrapper/#dbe6d8d0ceb1