Add release note

Author: justinyoo

release-notes/v1.1.0.md

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+## Release Notes ##
+
+Bug fixes and enhancements
+
+
+### Changes & Fixes ###
+
+* #358 Refactor sample apps for .NET 6 in-proc/out-of-proc
+* #330 Allow relative URL being used as base URL
+* #329 Deprecated feature implementation #319
+* #318 Resolve TypeLoadException for QueryCollection #296
+* #311 Support Required attribute #226
+* #310 Fixes: Enum of type byte is ignored #309
+* #301 Fix: OpenAPI attributes are not getting picked up if they are in a referenced class library project #298
+* #297 Add a HideDocument flag akin to HideSwaggerUI