Add changes required for reveiw comments

Signed-off-by: Vivek Singh <vivekkmr45@yahoo.in>

schema/describe.go

@@ -0,0 +1,17 @@
+// Copyright (c) OpenFaaS Author(s) 2018. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package schema
+
+//FunctionDescription information related to a function
+type FunctionDescription struct {
+	Name              string
+	Status            string
+	Replicas          int
+	AvailableReplicas int
+	InvocationCount   int
+	Image             string
+	EnvProcess        string
+	URL               string
+	AsyncURL          string
+}