Add necessary references to Nuspec file

Author: Chavoshi

Package.nuspec

@@ -13,6 +13,20 @@
     <releaseNotes>Entire Unity Library as single package.</releaseNotes>
     <copyright>Copyright © Microsoft 2008</copyright>
     <tags>Unity Container unitycontainer Microsoft.Practices.Unity IoC</tags>
+    <dependencies>
+      <group targetFramework=".NETCoreApp2.0">
+        <dependency id="System.Configuration.ConfigurationManager" version="4.4.1" exclude="Build,Analyzers" />
+        <dependency id="System.Reflection.Emit" version="4.3.0" exclude="Build,Analyzers" />
+      </group>
+      <group targetFramework=".NETStandard2.0">
+        <dependency id="System.Configuration.ConfigurationManager" version="4.4.1" exclude="Build,Analyzers" />
+        <dependency id="System.Reflection.Emit" version="4.3.0" exclude="Build,Analyzers" />
+      </group>
+    </dependencies>
+    <frameworkAssemblies>
+      <frameworkAssembly assemblyName="System.Configuration" targetFramework=".NETFramework4.5, .NETFramework4.6, .NETFramework4.7" />
+      <frameworkAssembly assemblyName="System.Runtime.Remoting" targetFramework=".NETFramework4.5, .NETFramework4.6, .NETFramework4.7" />
+    </frameworkAssemblies>
   </metadata>
   <files>
     <file src="lib\**" target="lib" exclude="**\*.nupkg" />