Add process operation method.

增加开启异步操作的方法。

Assets/YooAsset/Runtime/OperationSystem/GameAsyncOperation.cs

@@ -0,0 +1,18 @@
+
+namespace YooAsset
+{
+	public class GameAsyncOperation : AsyncOperationBase
+	{
+		internal override void Start()
+		{
+			OnStart();
+		}
+		internal override void Update()
+		{
+			OnUpdate();
+		}
+
+		protected virtual void OnStart() { }
+		protected virtual void OnUpdate() { }
+	}
+}

Assets/YooAsset/Runtime/OperationSystem/GameAsyncOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ff8a96dd005f55346986f8a98aff8c99
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Runtime/YooAssets.cs

@@ -286,6 +286,15 @@ namespace YooAsset
 			}
 		}
 
+		/// <summary>
+		/// 开启一个异步操作
+		/// </summary>
+		/// <param name="operation">异步操作对象</param>
+		public static void ProcessOperaiton(GameAsyncOperation operation)
+		{
+			OperationSystem.ProcessOperaiton(operation);
+		}
+
 		/// <summary>
 		/// 获取资源版本号
 		/// </summary>