carb_nitro_ratio in soil package

[mslarae13]

Current term details Please supply the current details of the term that you would like to update:

Term name - carbon/nitrogen ratio
Term ID - carb_nitro_ratio
Structured comment name - 
Definition - Ratio of amount or concentrations of carbon to nitrogen
Expected value - measurement value 
Value syntax - {float} {unit}
Example - 
Preferred unit - 
Package(s) - sediment & water

Suggested update(s) Please supply the new suggestions for any of the details listed below (only insert text to those details that should be updated):

Term name - 
Structured comment name - 
Definition - 
Expected value - 
Value syntax -
Example -
Preferred unit - 
Package(s) - soil

Additional context soil carbon/nitrogen ratio is important for carbon chemistry and often reported. Especially as a factor of microbial carbon/nitrogen ratio. This term should be added to the soil package & depending on resolution for https://github.com/GenomicsStandardsConsortium/mixs/issues/309 , microbial c/n might need to be a totally different term.