Add compilation error for missing battery #105
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What
This PR adds a compiler error, incase the user forgets to define a battery. This makes the project easier for beginners.
Why
The USER_SETTINGS.h file is blank when a new user starts. If nothing is defined and you try to compile, the current compiler error doesn't really make sense:
How
A compiler #error is used to guide the user to the correct place, so a battery can be defined
