[CLA] add corporate signature for Invitu

doc/cla/corporate/invitu.md

+French Polynesia (Tahiti), 2015-10-22
+
+Invitu agrees to the terms of the Odoo Corporate Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Cyril Vinh-Tung contact@invitu.com https://github.com/invitu
+
+List of contributors:
+Cyril Vinh-Tung contact@invitu.com https://github.com/invitu
+