Update iMac_in_the_lab.md

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Author: avanaudenhaege

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+There are currently (update: July 2024) 4 iMacs in the lab. 
+If you want information about a computer or iMac in the lab, please consult this [excel sheet] (https://docs.google.com/spreadsheets/d/1U5_rjj5mzXzh_8bLA_Rx3FmDdpYIUx2Y_z8SJPnKTHg/edit?gid=0#gid=0). 
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+It is good practice to create your own account on the computer in order not to install on the same account a different version of Matlab Tools. 
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+All iMacs have an **admin** account, password : **CPP**.