Re-organize all projects (#4166)

Content.Client/Module/ClientModuleManager.cs

@@ -0,0 +1,15 @@
+using Content.Shared.Module;
+
+namespace Content.Client.Module
+{
+    /// <summary>
+    /// Client implementation of IModuleManager.
+    /// Provides simple way for shared code to check if it's being run by
+    /// the client of the server.
+    /// </summary>
+    public class ClientModuleManager : IModuleManager
+    {
+        bool IModuleManager.IsClientModule => true;
+        bool IModuleManager.IsServerModule => false;
+    }
+}