support upm Samples

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Example/ExampleAssets/Scripts/Runtime/MackySoft.SerializeReferenceExtensions.Example.asmdef

@@ -1,18 +0,0 @@
-{
-    "name": "MackySoft.SerializeReferenceExtensions.Example",
-    "rootNamespace": "",
-    "references": [
-        "GUID:49b49c76ee64f6b41bf28ef951cb0e50"
-    ],
-    "includePlatforms": [],
-    "excludePlatforms": [],
-    "allowUnsafeCode": false,
-    "overrideReferences": false,
-    "precompiledReferences": [],
-    "autoReferenced": true,
-    "defineConstraints": [
-        "UNITY_2019_3_OR_NEWER"
-    ],
-    "versionDefines": [],
-    "noEngineReferences": false
-}

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Example/ExampleAssets/Scripts/Runtime/MackySoft.SerializeReferenceExtensions.Example.asmdef.meta

@@ -1,7 +0,0 @@
-fileFormatVersion: 2
-guid: b427d1329953ae946a0fcb528efcb3a3
-AssemblyDefinitionImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/package.json

@@ -6,5 +6,12 @@
 	"description": "Provide popup to specify the type of the field serialized by the [SerializeReference] attribute in the inspector.",
 	"keywords": [ "SerializeReference", "Editor" ],
 	"license": "MIT",
-	"dependencies": {}
+	"dependencies": {},
+	"samples": [
+		{
+			"displayName": "Example",
+			"description": "",
+			"path": "Example"
+		}
+	]
 }