💡 Add term "composition"

[khatamirad]

Description

composition: concentration of main constituent elements of a material, expressed in weight percentage or mole fraction.

[HendrikBorgelt]

Hi @khatamirad,

what is the purpose of this issue, do you want to add a new term composition, do you want to modify an existing term (if so i can not find the respective term) or do you just want to have a discussion regarding a term?
If so i can either help you add the new term or i would like to link to the respective definition in the rdf files, so that it is easier for other contributers to follow up on this issue.

[HendrikBorgelt]

@khatamirad,

can you please fill out this issue template so that you have a range attributed as well registered Contributer name. Otherwise all the new terms will not be referenced accordingly.

I will create the respective new term in the meantime and reference you in its creation.

the current pull request for the term can be found here: #78

[dalito]

IDs were requested in #79 and granted in #80.