docs: add HWBCS SDK configuration
Add HWBCS SDK configuration to the top-level makefile.
@@ -192,6 +192,7 @@ BOAT_PROTOCOL_USE_PLATON ?= 1
BOAT_PROTOCOL_USE_PLATONE ?= 1
BOAT_PROTOCOL_USE_FISCOBCOS ?= 1
BOAT_PROTOCOL_USE_HLFABRIC ?= 1
+BOAT_PROTOCOL_USE_HWBCS ?= 1
````
As needed, change the value of the corresponding variable to `1` or `0` to enable or disable the corresponding blockchain protocol. Or while compiling the SDK, use make \<BOAT_PROTOCOL_USE_XXX\>=<1|0> to enable or disable the corresponding blockchain protocol.
