Add missing local.settings.json file

Author: justinyoo

src/EasyAuth.FunctionApp/local.settings.sample.json

@@ -0,0 +1,7 @@
+{
+  "IsEncrypted": false,
+  "Values": {
+    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
+    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
+  }
+}