Added contribution guide

[roll]

• fixes Design development model regarding branching/deployments #945
• fixes Add/update a contribution guide #929
• fixes Write down versioning / changing rules #858

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This PR finalizes set of actions to start with a new branch-based development model. I haven't found any suitable fully automated model like https://github.com/googleapis/release-please-action that matches our needs.

Anyway, the version updates are automated so for now we just need to maintain a releasing PR manually (which might be a good thing in the end).

Live preview - https://929-contribution-guide.datapackage-6gp.pages.dev/overview/contributing/

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Deploying datapackage with    Cloudflare Pages

Latest commit:	8e4c6c0
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Branch Preview URL:	https://929-contribution-guide.datapackage-6gp.pages.dev

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[roll]

Hi @peterdesmet, can you please take a look? Once, it's merged we will have a free way to work on new versions I believe

[peterdesmet]

@roll I'll try to have a look this week. Can you already a a .github/CONTRIBUTING.md (a default place for such a guide) and link to the web page?

[roll]

@peterdesmet
Thanks!

Can you already a a .github/CONTRIBUTING.md (a default place for such a guide) and link to the web page?

I will try to do so

[roll]

@peterdesmet
Have you had a chance to take a look? Or you would just like me to move CONTRIBUTING.md first?

[peterdesmet]

Have you had a chance to take a look?

I haven't, it's on my todo 😄

Or you would just like me to move CONTRIBUTING.md first?

We could move it or make it easier have that file just refer to the (to be published) contributing guide on the website, cf. what I do here for the code of conduct: https://github.com/frictionlessdata/frictionless-r/blob/main/.github/CODE_OF_CONDUCT.md

[roll]

Agree, moved it to the repo root using a symlink