Add ArcCommander credential manager storing setup

[HLWeil]

In the section sharing your arc, prior to running the remote token get command, it might be necessary to setup git credential storing:

Windows: git config --global credential.helper cache or git config --global credential.helper store

Mac: git config --global credential.helper osxkeychain

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Moved from https://github.com/nfdi4plants/arcCommander-docs/issues/4

[Brilator]

I'd suggest to also add this here https://nfdi4plants.org/nfdi4plants.knowledgebase/docs/implementation/ArcCommanderManual/arc_access.html

[HLWeil]

Agreed!

[Brilator]

What's the command for Linux?

[Brilator]

git config --global credential.helper store seemed to do the job on ubuntu

[Brilator]

https://github.com/nfdi4plants/nfdi4plants.knowledgebase/pull/66/commits/f8a5b9881126b076cdfbddb27803b3141dba8498

[Martin-Kuhl]

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