ARROW-298: create release scripts

Author: Julien Le Dem <julien@dremio.com>

Closes apache#141 from julienledem/release and squashes the following commits:

1a5114d [Julien Le Dem] ARROW-298: create release scripts

Author: julienledem

README.md

@@ -0,0 +1,14 @@
+# Arrow Java
+
+## Setup Build Environment
+
+install:
+ - java 7 or later
+ - maven 3.3 or later
+
+## Building running tests
+
+```
+cd java
+mvn install
+```