Add api of available models

Add api of available models

• The official API added the 'API of available models' feature, which is now included within the wrapper.
• The requirement for 'models' when creating an image has been removed.

PR: #3

Add Vitest

• Add vitest for project testing, ensuring stable quality.
• Modify new initialization method.
• Updated readme Initialization block.
• Add error message to tell detail.

update readme

add new model options

First release

Welcome to my first release