Add CM3 and CMIO3 schematics

Author: jimbojr

hardware/computemodule/RPI-CM3-V1_0-SCHEMATIC.pdf

@@ -3,10 +3,12 @@
 Schematics for the Compute Module
 
 * [CM Rev 1.1](RPI-CM-V1_1-SCHEMATIC.pdf)
+* [CM3 and CM3L Rev 1.0](RPI-CM3-V1_0-SCHEMATIC.pdf)
 
-Schematics for the Compute Module IO board (CMIO)
+Schematics for the Compute Module IO board (CMIO). 
 
-* [CMIO Rev 1.2](RPI-CMIO-V1_2-SCHEMATIC.pdf)
+* [CMIO Rev 1.2 (Supports CM1 only)](RPI-CMIO-V1_2-SCHEMATIC.pdf)
+* [CMIO Rev 3.0 (Supports CM1, CM3 and CM3L)](RPI-CMIO-V3_0-SCHEMATIC.pdf)
 
 Schematics for the Compute Module camera/display adapter board (CMCDA)