docs: add funding and stipend document

[sheremet-va]

No description provided.

[macarie]

A couple of missed replacements I think?

Re: the currency. Since OC handles different currencies, maybe we could add a line about that? Invoicing in a different currency is nightmarish 😬

[sheremet-va]

Re: the currency. Since OC handles different currencies, maybe we could add a line about that? Invoicing in a different currency is nightmarish 😬

What do you mean? You can specify any currency 🤔

[macarie]

Re: the currency. Since OC handles different currencies, maybe we could add a line about that? Invoicing in a different currency is nightmarish 😬

What do you mean? You can specify any currency 🤔

Since it also seems to be a sort of quick guide, I'd add a short sentence stating that it's possible to select any currency supported by OC, as long as it converts to US$3000.

Something like this (using bold for the addition):

To claim, file an expense on our Open Collective with a link to this section as Additional Information: https://github.com/vitest-dev/.github/blob/main/FUNDING.md#core-team-member-stipend. You may file in any currency Open Collective supports, as long as the converted amount does not exceed $3000 USD. The number of hours do not need to be described as we trust maintainers to report the amount in good faith.

[sheremet-va]

Added the note