Battery tentacle created.

Makefile

@@ -6,6 +6,7 @@ export GOCACHE
 build:
 	go build -buildvcs=false -mod=readonly -o hello-world/bin/hello-world ./hello-world/src
 	go build -buildvcs=false -mod=readonly -o wormhole/bin/wormhole-tentacle ./wormhole/src
+	go build -buildvcs=false -mod=readonly -o battery-status/bin/battery-status ./battery-status/src
 
 check: build
 	go vet ./...