Update readme to include Talos II

README.md

 # br-blackbird-external
 
-external buildroot tree. For building minimal raptorcs/blackbird bmc images
+External buildroot tree. For building minimal Raptor Computer Systems Blackbird or Talos II bmc images
 
 requirements:
 * u-boot tools' mkimage (with FIT support)
 
 Recommend/Tested buildroot version: 2019.08
 
-to build, you just be in the root of buildroot, and run:
+To build the blackbird image, you just be in the root of buildroot, and run:
 ```
 make BR2_EXTERNAL=${PATH_TO_THIS_BR_EXTERNAL} O=${BUILD_DIR} blackbird-bmc_defconfig
 make O=${BUILD_DIR}
 ```
+
+The Talos II directions are similar:
+```
+make BR2_EXTERNAL=${PATH_TO_THIS_BR_EXTERNAL} O=${BUILD_DIR} talos-bmc_defconfig
+make O=${BUILD_DIR}
+```