add comments to swagger

SurveyBackend/SurveyBackend.API/Program.cs

@@ -98,6 +98,9 @@ public class Program
                     Array.Empty<string>()
                 }
             });
+
+            var filePath = Path.Combine(System.AppContext.BaseDirectory, "SurveyBackend.API.xml");
+            c.IncludeXmlComments(filePath);
         });
 
         var app = builder.Build();

SurveyBackend/SurveyBackend.API/SurveyBackend.API.csproj

@@ -7,6 +7,14 @@
         <RootNamespace>SurveyBackend</RootNamespace>
     </PropertyGroup>
 
+    <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+      <DocumentationFile>bin\Debug\SurveyBackend.API.xml</DocumentationFile>
+    </PropertyGroup>
+
+    <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+      <DocumentationFile>bin\Release\SurveyBackend.API.xml</DocumentationFile>
+    </PropertyGroup>
+
     <ItemGroup>
         <Content Update="appsettings.*.json">
             <CopyToPublishDirectory>Never</CopyToPublishDirectory>