reset repository to QuantumCore.jl

[Krastanov]

This follows up on #1 (comment)

It basically copies over https://github.com/Krastanov/QuantumCore.jl

[codecov]

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[Krastanov]

@david-pl , if this looks good:

• I can go ahead an merge it
• Could you rename the repository to QuantumCore.jl
• I will finish some minor polish and hopefully make the CI tasks work better -- I would not wait for review on these initial polishing tasks
• Submit a pull request to QuantumOpticsBase.jl - that would probably be a good place to do the actual review
• Register this package
• Merge the pull request to QuantumOpticsBase
• Protect the main branch here, and continue iterating on this package through pull requests (we will figure out some reviewer rules that we are happy with -- I do not know the rules you follow for the rest of qojulia, but probably we can just follow them)
• Register QSymbolics (and decide on a home organization for it)

[david-pl]

@Krastanov I renamed the repository. The definitions included so far make sense and look good to me, so go ahead and merge it.

I also agree with the overall plan you detailed. Thanks for all your input!