Feature Request: Hyperlinks

[TransMux]

Thank you for developing such great library to convert General structure to Xmind Files. I have been using Xmind for years and really benefited from it a lot. Xmindmark is such a Groundbreaking idea that i believe it will be commonly used just like markdown in the future.

Meanwhile, i also loves the hyperlinks feature in xmind a lot as Linking to outer resources is common. I would appreciate it if hyperlinks can also be added to Xmindmark.

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As for me, maybe we can use a grammar just like markdown:

Seasons of 2021

- (Spring)[link]
- Summer [B1]
- Autumn [B1]
- Winter

And the expected output would be:

Thanks a lot!