Add required dependencies to NuGet specification

Author: sharwell

src/corelib/corelib.nuspec

@@ -13,6 +13,17 @@
     <releaseNotes>https://github.com/openstacknetsdk/openstack.net/releases/v$version$</releaseNotes>
     <copyright></copyright>
     <tags>openstack</tags>
+    <dependencies>
+      <group targetFramework="4.0">
+        <dependency id="SimpleRESTServices" version="1.2.0.0" />
+        <dependency id="Newtonsoft.Json" version="5.0.6" />
+      </group>
+      <group targetFramework="3.5">
+        <dependency id="SimpleRESTServices" version="1.2.0.0" />
+        <dependency id="Newtonsoft.Json" version="5.0.6" />
+        <dependency id="TaskParallelLibrary" version="1.0.2856.0" />
+      </group>
+    </dependencies>
   </metadata>
   <files>