[CLA] Added Abstractive corporate CLA

closes odoo/odoo#104076

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

doc/cla/corporate/abstractive.md

+Belgium, 2022-10-25
+
+Abstractive BV 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,
+
+Vincent Baggerman vincent.baggerman@abstractive.be https://github.com/vincentius
+
+
+List of contributors:
+
+Vincent Baggerman vincent.baggerman@abstractive.be https://github.com/vincentius
+Sibert Aerts sibert.aerts@abstractive.be https://github.com/Sibert-Aerts
+Bart D'haese bart.dhaese@abstractive.be https://github.com/Bart-dh
+