Merge pull request #69 from googleapis/README

Remove all stale info from README and clarify status

Author: andrewsg

packages/google-cloud-ndb/README.md

@@ -2,42 +2,23 @@
 
 ## Introduction
 
-`ndb` is a client library for use with [Google Cloud Datastore][0].
-It was designed specifically to be used from within the
-[Google App Engine][1] Python runtime.
+This is a Python 3 version of the `ndb` client library for use with
+[Google Cloud Datastore][0].
 
-## Overview
-
-Learn how to use the `ndb` library by visiting the Google Cloud Platform
-[documentation][2].
+The original Python 2 version of `ndb` was designed specifically for the
+[Google App Engine][1] `python27` runtime and can be found at
+https://github.com/GoogleCloudPlatform/datastore-ndb-python. This version of
+`ndb` is designed for the [Google App Engine Python 3 runtime][2], and will
+run on other Python 3 platforms as well.
 
 [0]: https://cloud.google.com/datastore
 [1]: https://cloud.google.com/appengine
-[2]: https://cloud.google.com/appengine/docs/python/ndb/
-
-## Installation 
+[2]: https://cloud.google.com/appengine/docs/standard/python3/
 
-Install this library in a virtualenv using pip. virtualenv is a tool to create isolated Python environments. The basic problem it addresses is one of dependencies and versions, and indirectly permissions.
+## Release Status
 
-With virtualenv, it's possible to install this library without needing system install permissions, and without clashing with the installed system dependencies.
+This version of the client is not yet officially released (it is in a
+pre-Alpha state) and is still under active development.
 
 ### Supported Python Versions
 Python >= 3.6
-
-As this package is designed to work in the [AppEngine runtime](https://cloud.google.com/appengine/docs/python/) Python 3.6+ are supported. 
-
-### Mac/Linux
-```
-pip install virtualenv
-virtualenv <your-env>
-source <your-env>/bin/activate
-<your-env>/bin/pip install google-cloud-ndb
-```
-
-### Windows
-```
-pip install virtualenv
-virtualenv <your-env>
-<your-env>\Scripts\activate
-<your-env>\Scripts\pip.exe install google-cloud-ndb
-```