how to compile a package in quartusII

You have to build a new project named "adder". You can use the New Project Wizard and follow the hints. I suggest you to use a folder named "adder" and put the vhd files in this folder.

During the new project wizard you have to add all the vhdl files in the file list.

Then you have to create a top-level design file (can be a bdf schematic or a top-level vhdl file) which will specify the connections between the two modules that you have designed before.

After that you will have to compile the new project "adder" and you will have the desired result.