add sigs/README.md

sigs/README.md

@@ -28,3 +28,4 @@ in the mailing list. SIG artifacts can be found in the current repository.
 | MSLITE | This SIG is responsible for the development of MindSpore lite. | [@zhaizhiqiang](https://gitee.com/zhaizhiqiang)(zhaizhiqiang@huawei.com) |
 | MDP | This SIG is responsible for the development of MindSpore programming library for Bayesian deep learning. | [@jianfeichen](https://gitee.com/jianfeichen)(chrisjianfeichen@gmail.com) |
 | Parallel | This SIG is responsible for the development of MindSpore's functionality of automatically finding the efficient parallel strategy for DNN training and inference. | [@stsuteng](https://gitee.com/stsuteng)(suteng@huawei.com) |
+| Serving | This SIG is responsible for the development of MindSpore Serving module. | [@xu-yfei](https://gitee.com/xu-yfei)(xuyongfei@huawei.com) |