Can i add an account domain1.com and then point domain2.com to the same folder.?

So if i have a php file it says welcome to domain1 if i open it on domain1.com and it says domain2 if i open domain2.com?

Yes, you can.

You will create the main account: User Accounts → New Account.

For the additional domain, you will create that under the menu: Domains → Add Domain.

That will ask you for the user, which you created above under User Account.

Then you can either point to the root of the same directory, or a sub-folder.

Or you can user Cloudflare to redirect the domain to another.