If you are asking whether or not you can set it up so that multiple users can access that instance - then no. One developer license per developer using the instance.
Hi Jeff, I think i didnt text the matter properly. what iam asking is,I will be using only one developer as my license is for single developer. after logging in wether i will be able to create multipe users in the database or not??
The developer edition is a fully functional instance of SQL Server with all the features of Enterprise Edition. So yes - you can create the users without a problem. However, you cannot have those users logging into the system and using the server.
If you need to be able to setup an application and test it - then that isn't a problem. Just be aware that you cannot have actual end users accessing the system - it has to be you accessing the system for your development work.
I would recommend that you read the EULA for the developer edition. It explains all of this in great detail.