Initial creation of subdirectory for application-benchmarks subproject.

Add stack component examples as requested.

application-benchmarks/OWNERS

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+reviewers:
+- sig-scalability-reviewers
+
+approvers:
+- sig-scalability-approvers
+- jberkus
+- wojtek-t

application-benchmarks/README.md

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+# Application Performance and Benchmarking
+
+This directory contains the files for the Application Performance and Benchmarking subproject of SIG-Scalability.  The subproject's mission is:
+
+* Develop repeatable benchmarking scripts, tools, and configurations for testing the performance of applications running on Kubernetes together with stack components such as CSI drivers and network overlays
+* Share and publish results of benchmarking tests
+* Develop automated tests to monitor for application performance regressions
+
+## Discussion and Contacts
+
+- Issues: file issues in this repository
+- Chat: #sig-scalability in slack.k8s.io
+- Meetings: no meetings scheduled yet
+
+## Owners
+
+Initial subproject owners are:
+
+- Josh Berkus (@jberkus) of Red Hat
+- Wojciech Tyczynski (@wojtek-t) of Google
+
+Once we have built out results and test parameters, the owners list will be updated with the actual contributors to the project.