add @oising as powershell owner (CommunityToolkit#839)

Co-authored-by: Oisin Grehan <oisin.grehan@ionodes.com>

Author: 2 people

CODEOWNERS

@@ -131,3 +131,9 @@
 /examples/opentelemetry-collector/ @martinjt
 /src/CommunityToolkit.Aspire.Hosting.OpenTelemetryCollector/ @martinjt
 /tests/CommunityToolkit.Aspire.Hosting.OpenTelemetryCollector.Tests/ @martinjt
+
+# CommunityToolkit.Aspire.Hosting.PowerShell
+
+/src/CommunityToolkit.Aspire.Hosting.PowerShell/ @oising
+/tests/CommunityToolkit.Aspire.Hosting.PowerShell.Tests/ @oising
+/examples/powershell/ @oising