Add a proposal draft for the natural language syntax

[Ludee]

Example files: https://github.com/OpenEnergyPlatform/oekg/tree/proposal/draft/proposals/DevKopSys

[stap-m]

@Ludee in the OEO repo, we try to use more informative issue headings, that can be read as a continuation of sentence "The issue is about...". I'd recommend to do that here aswell 😉

[Ludee]

Thanks for pointing this out. It was an example issue to start the collaborative workflow for the repo. We created a branch with the proposal for a natural language syntax. This issue should start the workflow: Issue->Branch->PR