Add meeting infomation for sig ai.

1. Add meeting infomation for sig ai.
2. Add charter for sig ai.

sig-ai/README.md

+# SIG AI
+
+SIG AI is responsible to provide general platform capabilities based on KubeEdge so  that AI applications running at the edge can benefit from cost reduction, model performance improvement, and data privacy protection.
+
+
+The [charter](charter.md) defines the scope and governance of the AI Special Interest Group.
+
+## Meetings
+
+
+* Regular SIG Meeting: [Thursday at 10:00 UTC+8](https://zoom.us/my/kubeedge) (weekly, starts on Nov. 12th 2020). [Convert to your timezone](https://www.thetimezoneconverter.com/?t=10%3A00%20am&tz=GMT%2B8&).
+ * [Meeting notes and Agenda](https://docs.google.com/document/d/e/2PACX-1vSKVQSQ4tmBsApIHVdH3sLJluzqSitRpRSr88VEgBMeTMCYczgPnuKhTfdF9srE0Obk9cTygHTste-N/pub).
+ * [Meeting Calendar](https://calendar.google.com/calendar/u/0?cid=Y19nODluOXAwOG05MzFiYWM3NmZsajgwZzEwOEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t) | [Subscribe](https://calendar.google.com/calendar?cid=OHJqazhvNTE2dmZ0ZTIxcWlidmxhZTNsajRAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ)
+ 
+## Contact
+- Slack: [#sig-ai](to be filled)
+- [Mailing list](https://groups.google.com/forum/#!forum/kubeedge)
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sig-ai/charter.md

+# SIG AI Charter
+
+This charter adheres to the conventions described in [KubeEdge Open Governance](https://github.com/kubeedge/community/blob/master/GOVERNANCE.md) and uses the Roles and Organization Management outlined in the governance doc.
+
+## Scope
+
+SIG AI is responsible to provide general platform capabilities based on KubeEdge so  that AI applications running at the edge can benefit from cost reduction, model performance improvement, and data privacy protection.
+
+### In scope
+
+#### Areas of Focus
+
+- an edge-cloud collaborative AI framework based on KubeEdge
+- with embed collaborative training and joint inference algorithm
+- working with existing AI framework like Tensorflow, etc.
+
+### Out of scope
+- to re-invent existing ML framework, i.e., tensorflow, pytorch, mindspore, etc.
+- to re-invent existing edge platform, i.e., kubeedge, etc.
+- to offer domain/application-specific algorithms, i.e., facial recognition, text classification, etc.
+
+## Roles and Organization Management
+
+This SIG follows and adheres to the Roles and Organization Management outlined in KubeEdge Open Governance and opts-in to updates and modifications to KubeEdge Open Governance.
+
+### Additional responsibilities of Chairs
+
+- Manage and curate the project boards associated with all sub-projects ahead of every SIG meeting so they may be discussed
+- Ensure the agenda is populated 24 hours in advance of the meeting, or the meeting is then cancelled
+- Report the SIG status at events and community meetings wherever possible
+- Actively promote diversity and inclusion in the SIG
+- Uphold the KubeEdge Code of Conduct especially in terms of personal behavior and responsibility
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