Adding API Endpoints for Catalog Items (#410)

* Adding new Endpoints

* update nuget packages

* Modifying API to work well with Swagger.

* Remove Swashbuckle.Core

tests/IntegrationTests/IntegrationTests.csproj

@@ -7,11 +7,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="3.1.4" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="3.1.5" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
-    <PackageReference Include="Moq" Version="4.14.1" />
+    <PackageReference Include="Moq" Version="4.14.4" />
     <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>