add a readme for the examples

Author: germanattanasio

examples/README.md

@@ -0,0 +1,12 @@
+## Examples
+To run the examples, you will need the `username` and `password` credentials. To get your service credentials, follow these steps:
+ 1. Log in to Bluemix at https://bluemix.net.
+
+ 1. Create an instance of the service:
+     1. In the Bluemix **Catalog**, select the Natural Language Classifier service.
+     1. Under **Add Service**, type a unique name for the service instance in the Service name field. For example, type `my-service-name`. Leave the default values for the other options.
+     1. Click **Use**.
+
+ 1. Copy your credentials:
+     1. On the left side of the page, click **Service Credentials** to view your service credentials.
+     1. Copy `username` and `password` from these service credentials.