feat: add Bun install on existing project

[PlayerNguyen]

Add Bun install on an existing project with bun install command as an additional step.

[ryuapp]

Hello. The purpose of getting started is to create a new Hono project, so this addition seems unnecessary. The guide should be simple.

However, your point is correct, so why don't u add it as an other section(add Hono to an exsisting project)?

[PlayerNguyen]

Hi @ryuapp,

I understand that we can put this into a different section. However, I am not too familiar with this documentation format. Moreover, this one, I expected worked and tested with Bun. So the only question here is "It is necessary to create a new section instead?".

[PlayerNguyen]

I found that the Getting Started > Basic is quite suitable for putting the section above.

[yusukebe]

Hi @PlayerNguyen !

This is a good suggestion. I've left a comment. Check it.

[PlayerNguyen]

@yusukebe I already use bun add instead. Can you please check it again?

[yusukebe]

@PlayerNguyen Looks good! Merging now. Thank you for your contribution!