New github-centric readme

Author: stickfigure

README.md

@@ -0,0 +1,40 @@
+Objectify is a Java data access API specifically designed for the Google App Engine datastore.  It occupies a
+"middle ground"; easier to use and more transparent than JDO or JPA, but significantly more convenient than
+the Low-Level API.  Objectify is designed to make novices immediately productive yet also expose the full power
+of the GAE datastore.
+
+  * Objectify lets you persist, retrieve, delete, and query your own **typed objects**.
+```
+@Entity
+class Car {
+    @Id String vin; // Can be Long, long, or String
+    String color;
+}
+  
+ofy().save().entity(new Car("123123", "red")).now();
+Car c = ofy().load().type(Car.class).id("123123").now();
+ofy().delete().entity(c);
+```
+  * Objectify surfaces **all native datastore features**, including batch operations, queries, transactions, asynchronous operations, and partial indexes.
+  * Objectify provides **type-safe key and query classes** using Java generics.
+  * Objectify provides a **human-friendly query interface**.
+  * Objectify can automatically **cache your data in memcache** for improved read performance.
+  * Objectify can store polymorphic entities and perform **true polymorphic queries**.
+  * Objectify provides a simple, **easy-to-understand transaction model**.
+  * Objectify provides built-in facilities to **help migrate schema changes** forward.
+  * Objectify provides **thorough documentation** of concepts as well as use cases.
+  * Objectify has an **extensive test suite** to prevent regressions.
+
+# Documentation
+
+Full documentation is availble in the [Objectify Wiki](https://github.com/objectify/objectify/wiki).
+
+# Downloads
+
+Objectify is released to the [Maven Central Repository](https://github.com/objectify/objectify/wiki/MavenRepository)
+and can be downloaded directly from there.
+
+# Help
+
+Help is provided in the
+[Objectify App Engine User Group](https://groups.google.com/forum/?fromgroups#!forum/objectify-appengine)