add sconscript

SConscript

@@ -0,0 +1,8 @@
+from building import *
+
+src	= Glob('*.c')
+cwd = GetCurrentDir()
+
+path = [cwd]
+group = DefineGroup('CMSIS-RTOS2', src, depend = ['PKG_USING_CMSIS_RTOS2'], CPPPATH = path)
+Return('group')