Trending @Capgemini; how can I show the experience that I have worked for this client in my cv?

im working for client project , I'm using their vdi I have mail id on their portal ,user name ... im in contract with them for 2 years working from Capgemini office ...it is only the project I'm working.....

so is how can I show that I have worked for this client in my cv ..... can I say client name ( contract ) -- Capgemini ( parent company ) like that...