adding new Bing Image Search quickstart sample (Azure-Samples#16)

* adding new Bing Image Search quickstart sample

* updating sample

samples/search/image-search-quickstart.py

@@ -0,0 +1,23 @@
+from azure.cognitiveservices.search.imagesearch import ImageSearchAPI
+from msrest.authentication import CognitiveServicesCredentials
+
+subscription_key = "Enter your key here"
+search_term = "canadian rockies"
+
+"""
+This application will search images on the web with the Bing Image Search API and print out first image result.
+"""
+#create the image search client
+client = ImageSearchAPI(CognitiveServicesCredentials(subscription_key))
+# send a search query to the Bing Image Search API
+image_results = client.images.search(query=search_term)
+print("Searching the web for images of: {}".format(search_term))
+
+# Image results
+if image_results.value:
+    first_image_result = image_results.value[0]
+    print("Total number of images returned: {}".format(len(image_results.value)))
+    print("First image thumbnail url: {}".format(first_image_result.thumbnail_url))
+    print("First image content url: {}".format(first_image_result.content_url))
+else:
+    print("Couldn't find image results!")