added CONTRIBUTORS.md for Windows and CNI plugins OWNERS.md

OWNERS.md

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+# Owners
+This is the official list of the CNI network plugins owners:
+- Bryan Boreham <bryan@weave.works> (@bboreham)
+- Casey Callendrello <casey.callendrello@coreos.com> (@squeed)
+- Dan Williams <dcbw@redhat.com> (@dcbw)
+- Gabe Rosenhouse <grosenhouse@pivotal.io> (@rosenhouse)
+- Matt Dupre <matt@tigera.io> (@matthewdupre)
+- Stefan Junker <stefan.junker@coreos.com> (@steveeJ)

plugins/main/windows/CONTRIBUTORS.md

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+# Contributors
+This is the official list of the Windows CNI network plugins contributors:
+ - @rakelkar
+ - @madhanrm
+ - @thxCode
+ - @nagiesek