Create charter.md

As per the request, drafted SIG API Machinery charter file.

sig-api-machinery/charter.md

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+# SIG API Machinery Charter
+
+This charter is a WIP.
+
+This charter adheres to the conventions described in the [Kubernetes Charter README] and uses
+the Roles and Organization Management outlined in [sig-governance].
+
+## Scope
+
+SIG API Machinery is responsible for the development and enhancement of Kubernetes master node.  The scope covers API server, persistence layer (etcd), controller manager, cloud controller manager, CustomResourceDefinition, scheduler and webhooks.
+
+### In scope
+
+#### Code, Binaries and Services
+
+All aspects of API server, API registration and discovery, generic API CRUD semantics, admission control, encoding/decoding, conversion, defaulting, persistence layer (etcd), OpenAPI, CustomResourceDefinition, webhooks, garbage collection, namespace lifecycle, and client libraries.
+
+#### Cross-cutting and Externally Facing Processes
+
+N/A
+
+### Out of scope
+
+The contents of individual APIs are owned by SIG Architecture
+
+## Roles and Organization Management
+
+This sig follows adheres to the Roles and Organization Management outlined in [sig-governance]
+and opts-in to updates and modifications to [sig-governance].
+
+### Additional responsibilities of Chairs
+
+N/A
+
+### Additional responsibilities of Tech Leads
+
+N/A
+
+### Deviations from [sig-governance]
+
+N/A
+
+### Subproject Creation
+
+1. SIG Technical Leads
+
+
+[sig-governance]: https://github.com/kubernetes/community/blob/master/committee-steering/governance/sig-governance.md
+[sig-subprojects]: https://github.com/kubernetes/community/blob/master/sig-YOURSIG/README.md#subprojects
+[Kubernetes Charter README]: https://github.com/kubernetes/community/blob/master/committee-steering/governance/README.md