add back README.md in deploy dir

deploy/README.md

@@ -0,0 +1,7 @@
+# 多端安全部署
+
+本目录为PaddleX模型部署代码，编译和使用教程参考：
+
+- [服务端部署(支持Python部署、C++部署、模型加密部署)](../docs/tutorials/deploy/deploy_server/)
+- [OpenVINO部署](../docs/tutorials/deploy/deploy_openvino.md)
+- [移动端部署](../docs/tutorials/deploy/deploy_lite.md)