BSC Added BSC_DOWNLOAD_SNAPSHOT to sample config

Author: vlasonfa

lib/bsc/sample-configs/.env-sample-full

@@ -11,6 +11,7 @@ AWS_REGION="us-east-2"
 
 ## Common configuration parameters ##
 BSC_NETWORK="mainnet"                                                            # All options:  "mainnet", "testnet"
+BSC_DOWNLOAD_SNAPSHOT="true"                                                     # All options: "true" | "false"
 BSC_NODE_CONFIGURATION="full"                                                    # All options:   "full"
 
 ## Instance Nodes