Update Atata.Configuration.Json.csproj to use PackageIcon instead of PackageIconUrl

Author: YevgeniyShunevych

src/Atata.Configuration.Json/Atata.Configuration.Json.csproj

@@ -23,7 +23,7 @@ Features:
     <PackageId>Atata.Configuration.Json</PackageId>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/atata-framework/atata-configuration-json</PackageProjectUrl>
-    <PackageIconUrl>https://raw.githubusercontent.com/atata-framework/atata/master/logo_68.png</PackageIconUrl>
+    <PackageIcon>icon.png</PackageIcon>
     <RepositoryUrl>https://github.com/atata-framework/atata-configuration-json</RepositoryUrl>
     <PackageTags>atata automation testing test selenium webdriver browser configuration</PackageTags>
     <PackageReleaseNotes>1.2.0 - https://atata.io/blog/2019/09/19/atata.configuration.json-1.2.0-released/
@@ -46,5 +46,9 @@ Features:
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
   </ItemGroup>
+  
+  <ItemGroup>
+    <None Include="icon.png" Pack="true" PackagePath="\" />
+  </ItemGroup>
 
 </Project>