添加系统签名
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a5586c3
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,21 @@
+.PHONEY: .o
+
+APPPATH=./app/build/outputs/apk/release
+BUILDAPK=app-release.apk
+SIGNAPK=app_sign.apk
+
+apk:
+	@echo "build app apk!"
+	gradlew assembleRelease
+	@echo "build android sign apk"
+	java -jar signapk.jar platform.x509.pem platform.pk8 $(APPPATH)/$(BUILDAPK) $(APPPATH)/$(SIGNAPK)
+	@echo "build upgrade zip"
+	python upgrade.py $(APPPATH)/$(SIGNAPK)
+clean:
+	@echo "remove build cache apk!"
+	rm -rf $(APPPATH)/$(BUILDAPK)
+	rm -rf $(APPPATH)/$(SIGNAPK)
+	rm -rf $(APPPATH)/hash256.sign
+	rm -rf $(APPPATH)/output.json
+	@echo "remove build cache file success"
+