Add makefile and binaries to run local dev network

.gitignore

@@ -3,3 +3,7 @@
 
 # Packages
 */node_modules
+
+# Local network
+localnet/db
+localnet/chain.log

localnet/Makefile

+OS:=$(shell uname -s)
+BINPATH:="./bin/xxnetwork-chain-darwin"
+
+ifeq ($(OS),Linux)
+	BINPATH:="./bin/xxnetwork-chain-linux"
+endif
+
+run:
+	@rm -rf db chain.log
+	$(BINPATH) --alice --chain xxnetwork-dev --base-path ./db --rpc-cors all >> ./chain.log 2>&1 &
+
+stop:
+	@kill -9 `ps aux | grep "xxnetwork-chain" | grep -v grep | awk '{print $$2}'` &> /dev/null || true