[CLA] signature for booo

Done at #18443

doc/cla/individual/booo.md

+Berlin, 2017-07-25
+
+I hereby agree to the terms of the Odoo Individual Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Philipp Borgers borgers@mi.fu-berlin.de https://github.com/booo