Fix nasa#1069, add detail design template

This file indicates which input dirs to use for the cFE detail
design document.  It should be controlled with OSAL, as this
knows the detail of the directory tree.

doc/osal-detaildesign.doxyfile.in

@@ -0,0 +1,7 @@
+# All of the OSAL FSW code relevant for cFE detail design is under
+# src/os and src/bsp, everything else is test and examples/support
+# Note this will include ALL OS/BSP layers, it does not currently filter
+# based on which OS/BSP is actually in use.
+INPUT    += @osal_MISSION_DIR@/src/os
+INPUT    += @osal_MISSION_DIR@/src/bsp
+