Restore README for Cloud Vision sample

Author: remi Taylor

vision/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
+
+# Google Cloud Vision API Ruby Samples
+
+The [Cloud Vision API][vision_docs] allows developers to easily integrate vision
+detection features within applications, including image labeling, face and
+landmark detection, optical character recognition (OCR), and tagging of explicit
+content.
+
+[vision_docs]: https://cloud.google.com/vision/docs/
+
+## Run sample
+
+To run the sample, first install dependencies:
+
+    bundle install
+
+Run the sample:
+
+    bundle exec ruby vision_samples.rb
+
+Usage:
+
+    Usage: ruby vision_samples.rb ...
+
+Example:
+
+    ...