Adding content management sample. (#304)

* initial commit adding project

* fixing links in readme file

* fixing broken links

* adding fixes and instructions

* improving Readme file

* adding getting started readme file

* adding fixes to url path

* adding exclusive path for Mac and Windows Platform

* Updating unity version

* Adding the sample in the main menu

* Clarify Content Management 101 project description

Reword description for Content Management 101 sample project.

Author: julianunity

Dots101/ContentManagement101/Assets/1. WeakObjectLoading.meta

@@ -0,0 +1,33 @@
+using Unity.Entities;
+using Unity.Entities.Content;
+
+namespace ContentManagement.Sample
+{
+    [UpdateBefore(typeof(WeakSceneLoadingSystem))]
+    [UpdateBefore(typeof(WeakObjectLoadingSystem))]
+    public partial struct LoadingLocalCatalogSystem : ISystem
+    {
+        private bool initialized;
+
+        public void OnCreate(ref SystemState state)
+        {
+            state.RequireForUpdate<LocalContent>();
+        }
+        
+        public void OnUpdate(ref SystemState state)
+        {
+            if (!initialized)
+            {
+                initialized = true;
+                UnityEngine.Debug.Log($"<color=green>Loading Content Delivery From local source</color>");
+                // When scriptable define ENABLE_CONTENT_DELIVERY is set,  
+                // we must initialize the content catalog before loading assets.
+                // We pass nulls in this case because the WeakObject sample doesn't use any remote catalog, 
+                // instead RuntimeContentSystem will automatically use the content from StreamingAssets folder packed in the 
+                // Binary build. (e.g. ContentManagementSample_Data/StreamingAssets/ for windows Standalone)
+                RuntimeContentSystem.LoadContentCatalog(null, null, null, true);
+                state.EntityManager.CreateEntity(typeof(ContentIsReady));
+            }
+        }
+    }
+}

Dots101/ContentManagement101/Assets/1. WeakObjectLoading/LoadingLocalCatalogSystem.cs

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