resources generate images support

Is your feature request related to a problem? Please describe.

When adding a new image resource to your project, it would be handy to be able to add one without going through https://images.nativescript.rocks/ or manually creating your own and placing them in the right folders.

Describe the solution you'd like

An extension of the resources generate command could be used that would act almost identically to the generate icons command, however it would use the original file name instead of "icon" when creating the different image sizes.

Describe alternatives you've considered

Making the generate icons command take another (optional) argument which allows an output name to be specified would also solve this issue

Anything else?

No response

Please accept these terms

• I have searched the existing issues as well as StackOverflow and this has not been posted before
• I agree to follow this project's Code of Conduct

先找出 resources generate 命令及其現有的圖示產生實作。擴充該命令，使用原始檔名產生影像尺寸，或支援可選的輸出名稱；當不需要外部工具或手動將檔案放入資料夾即可產生新的影像資源時，即表示完成。