DOC: add copyright info

Copyright/CrispCopyright.txt

+The part of the code that have been developped by Emmanuel Christophe
+between October 6th, 2008 and October 5th, 2010 is under copyright
+from Crisp / NUS.
+
+The code have been release to the OTB project under the Apache2
+license anywhere possible.
+
+See License_Apache2.txt for more details.

Copyright/License_Apache2.txt

+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.