[docs] Improve SDK documentation

[CorentinTh]

Improve and complete this doc page: https://docs.enclosed.cc/integrations/npm-package
The md file is located here : packages/docs/src/integrations/npm-package.md

[amarabamba]

Hi @CorentinTh,
I'm interested in this issue and want to help improve the doc on NPM package integration. To make sure that my PR meets expectations, could you specify what is currently missing?

• Is it necessary to detail the installation and use of the package?
• Is there a configuration example to add?
• Are there any specific guidelines to follow for the markdown format?

[CorentinTh]

Hi @amarabamba, thank you for taking this 🙏
Maybe also add a reamde in packages/lib reflecting the documention

Is it necessary to detail the installation and use of the package?

Yes that's the point

Is there a configuration example to add?

You can see https://github.com/CorentinTh/enclosed/blob/main/packages/lib/src/notes/notes.usecases.ts#L12 for the available config for the createNote function

Are there any specific guidelines to follow for the markdown format?

Nothing particuliar, standard npm lib doc stuff