add sig for huawei cloud provider (spinnaker#145)

sig-huaweicloud/README.md

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+# SIG: Huawei Cloud
+
+This SIG focuses on the current Huawei Cloud (HWC) clouddriver provider for Spinnaker.
+
+## Leadership
+
+**[Zeng Chen](https://github.com/zengchen1024)** \
+Senior Software Engineer \
+_Huawei_
+
+## Contact
+
+* [Slack](https://spinnakerteam.slack.com/archives/C01505U0FSN)
+
+## Scope
+
+*Status and Alignment*
+  * Review issues and PRs in [HWC Clouddriver](https://github.com/spinnaker/clouddriver/tree/master/clouddriver-huaweicloud) and other Spinnaker services which affect deployments to Huawei Cloud
+
+  * Review any topics related to upkeep of HWC Clouddriver functionality
+    * New releases and added features for HWC
+    * Overall Clouddriver changes which affect the HWC provider