Add LICENCE and CONTRIBUTING pages

CONTRIBUTING.adoc

@@ -0,0 +1,2 @@
+If you have not previously done so, please fill out and
+submit the https://cla.pivotal.io/sign/spring[Contributor License Agreement].

LICENSE.code.txt

@@ -0,0 +1,16 @@
+   All code in this repository is:
+   =======================================================================
+   Copyright (c) 2013 GoPivotal, Inc. All Rights Reserved
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+

LICENSE.writing.txt

@@ -0,0 +1 @@
+Except where otherwise noted, this work is licensed under http://creativecommons.org/licenses/by-nd/3.0/