Rename KMM to KMP

[EchoEllet]

Since Kotlin Multiplatform Mobile (KMM) has been renamed to Kotlin Multiplatform (KMP)
source

I renamed everything from KMM and Kotlin multiplatform mobile to KMP and Kotlin multiplatform without affecting the logic, just labeling that is all

because we can't rename everything since the plugin in Android studio is still called KMM so I didn't rename it, yet

Example of running in a successful state:

Before

./kdoctor 
Environment diagnose (to see all details, use -v option):
[✓] Operation System
[✓] Java
[✓] Android Studio
[✓] Xcode
[✓] CocoaPods

Conclusion:
  ✓ Your operation system is ready for Kotlin Multiplatform Mobile Development!

After

./kdoctor
Environment diagnose (to see all details, use -v option):
[✓] Operation System
[✓] Java
[✓] Android Studio
[✓] Xcode
[✓] CocoaPods

Conclusion:
  ✓ Your operation system is ready for Kotlin Multiplatform Development!

I also updated the README.md and the tests and the other messages

I also change one additional thing which is not related to the subject

Before

Shell.values().firstOrNull { it.path == shellPath }

After

Shell.entries.firstOrNull { it.path == shellPath }

Since in Kotlin 1.9.0, it's recommended to use entries instead of values()
in enum classes

there is one thing but I didn't change it
the diagnose should be diagnosis

it doesn't make much difference at least to me so I didn't update it

[iostyle]

kdoctor 1.1.0
Kotlin Multiplatform Mobile Plugin: not installed