Add basic terminology page for SIG-MC.

Signed-off-by: Laura Lorenz <[email protected]>

Author: lauralorenz

sig-multicluster/terminology.md

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+# Terminology
+
+This file contains terminology in common use by the SIG-Multicluster community, as well as aliases those terms may be used by past or present.
+
+For more information, see individual subprojects and documents, or the SIG-Multicluster website at https://multicluster.sigs.k8s.io/.
+
+## About API
+
+### Previously known as:
+
+-  ClusterProperty API
+
+
+## ClusterProfile API
+
+### Previously known as:
+
+- Cluster Inventory
+
+
+## ClusterSet
+
+
+## Multicluster Services API
+
+### Also known as:
+
+- MCS
+- MCS API
+
+
+## Namespace Sameness
+
+
+## Work API