Im/main fix nuget package (#6) (#7)

* use dotnet pack

* add deploy job

Author: icmoldovan

.github/workflows/build.yml

@@ -79,4 +79,5 @@ jobs:
         run: |
           foreach($file in (Get-ChildItem "${{ env.NuGetDirectory }}" -Recurse -Include *.nupkg)) {
               dotnet nuget push $file --api-key "${{ secrets.NUGET_APIKEY }}" --source https://api.nuget.org/v3/index.json --skip-duplicate
-          }
+          }
+