add sig for yandex cloud provider (spinnaker#168)

Proposing a SIG to focus on the Yandex.Cloud Provider spinnaker#166

sig-yandexcloud/README.md

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+# SIG: Yandex Cloud
+
+This SIG focuses on the current Yandex.Cloud (YC) clouddriver provider for Spinnaker.
+
+## Leadership
+
+* **[Vasilii Briginets](https://github.com/vasiliy-briginets)** Principal Software Engineer at Yandex 
+* **[Sergei Galiamichev](https://github.com/g-s-v)** Senior Software Engineer at Yandex
+* **[Sergey Kiselev](https://github.com/intr13)** Team Lead at Yandex
+
+## Contact
+
+* [Slack](https://spinnakerteam.slack.com/archives/sig-yandex)
+
+## Scope
+
+*Status and Alignment*
+  * Review issues and PRs in [YC clouddriver](https://github.com/spinnaker/clouddriver/tree/master/clouddriver-yandex) and other Spinnaker services which affect deployments to Yandex.Cloud
+
+  * Review any topics related to upkeep of YC Clouddriver functionality
+    * New releases and added features for YC
+    * Overall Clouddriver changes which affect the YC provider