Add README, refactor some variable names

Makefile

@@ -14,31 +14,32 @@ include ../skz-opack/src/opack.mk
 
 .PHONY: sync provision cleanrelease halt
 
-RELEASE=	release
-SRC=		../skzbsd-src
+RELEASE_PATH=	release
+SRC_REPO=	../skzbsd-src
+BRANCH=		master
 TARGET=		SKZ-VIRT
 
 cleanrelease:
-	rm -rf $(RELEASE)
+	rm -rf $(RELEASE_PATH)
 
 ssh-config: opack
 	(echo Host $(OPACK_TARGET) && (vagrant ssh-config | sed '1d')) > $@
 
 sync: ssh-config
 	scp -F ssh-config -q -r src $(OPACK_TARGET):/root/build
-	scp -F ssh-config -q -r $(SRC)/. $(OPACK_TARGET):/usr/src
+	scp -F ssh-config -q -r $(SRC_REPO)/. $(OPACK_TARGET):/usr/src
 
 provision: sync
 	vagrant ssh -c "make -C build all" || true
 	sleep 30 && while ! nc -z -w 10 $(shell grep HostName ssh-config | awk '{print $$2}') 22 2> /dev/null ; do sleep 10; printf '#'; done;\
 
 
-$(RELEASE): provision
+$(RELEASE_PATH): provision
 	mkdir -p $@
-	vagrant ssh -c "BUILD_TARGET=$(TARGET) make -C build/release all" || vagrant ssh -c "cat /var/log/master_build.log.err"
+	vagrant ssh -c "BUILD_TARGET=$(TARGET) TAG=$(BRANCH) make -C build/release all" || vagrant ssh -c "cat /var/log/master_build.log.err"
 	scp -F ssh-config -q -r $(OPACK_TARGET):'/home/build/master/*' $@
 
-halt: $(RELEASE)
+halt: $(RELEASE_PATH)
 	vagrant halt
 
 all: halt