added to package

Sample tutorial folder added to package, and is now visible and importable in the package manager.

com.unity.perception/package.json

   "displayName": "Perception",
   "name": "com.unity.perception",
   "unity": "2019.4",
-  "version": "0.4.0-preview.1"
+  "version": "0.4.0-preview.1",  
+  "samples":[
+    {
+      "displayName": "Tutorial Project",
+      "description": "This project accompanies the tutorial for the Perception Package, found at -link-",
+      "path" : "Samples/Tutorial Project"
+    }
+  ]
 }

com.unity.perception/Samples.meta

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+guid: 22fdb54b163034ca090443787cf8fff1
+folderAsset: yes
+DefaultImporter:
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+  userData: 
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com.unity.perception/Samples/Tutorial Project.meta

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+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.perception/Samples/Tutorial Project/.sample.json

+{
+	"displayName":"Tutorial Project",
+	"description": "This project accompanies the tutorial for the Perception Package, found at -link-",
+	"createSeparatePackage": false
+}

com.unity.perception/Samples/Tutorial Project/sample.cs.meta

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