Document that package names are camelcase

[masters3d]

#290

Create test on CI to test all package names are camel case.

[creaaa]

Dear master3d,

Hello, I'm Masa who issued #290.
Thanks for reviewing.

I'm sorry, I got lost.
Do I have to do something? (does it mean that I have to change the name in 'Package.swift' ?)
Do you mean that # 290 doesn't close unless I make an amendment?
(I suppose I should change the name in Package.swift "rotational-cipher" to upper-camel-case)
If you do, give me a time, please. I'll fix and notify you again.
If I'm misunderstanding, could you elaborate how to do?

Sincerely,
Masa

[masters3d]

Take your time. :)
The package name should match the solution file name.

[masters3d]

I'll take care of this issue. I am going to add a test case on the CI to check for this.

[creaaa]

Dear masters3d,

Thanks for replying!
Thankfully, I figured out what I should do so just a moment, please.
I'm going to notify you after I change the package name. 😁

Thanks,
Masa