A Library is not or cannot be an Application.
A Library is a collection of Functions / Methods that an Application can use and call to perform certain tasks, or to access certain features of the Library.
A library can be imported into a Application project to be used in this way, but in itself is is not an Application.
If you have designed a Library, and want to use it's functions, then you will have to create an Application that can import and use it, and or create documentation so hat others can use it as well.
Regards Mark