Add nuget restore

Author: ManlyMarco

.github/workflows/nuget.yml

@@ -19,7 +19,9 @@ jobs:
       uses: nuget/setup-nuget@v1
 
     - name: Nuget pack
-      run: nuget pack ConfigurationManager\ConfigurationManager.csproj -build -properties Configuration=Release
+      run: |
+        nuget restore
+        nuget pack ConfigurationManager\ConfigurationManager.csproj -build -properties Configuration=Release
       
     - name: Nuget push
       env: