Initial commit: BARON SSO 샘플 (WebView OIDC PKCE 인증 라이브러리 + 데모 앱)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

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+## .NET / Visual Studio
+bin/
+obj/
+.vs/
+*.user
+*.suo
+*.userosscache
+*.sln.docstates
+
+## Build results
+[Dd]ebug/
+[Rr]elease/
+x64/
+x86/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+
+## Publish output
+publish/
+*.publishsettings
+
+## WebView2 runtime / user data
+*.WebView2/
+EBWebView/
+
+## Rider / others
+.idea/
+*.DotSettings.user