feat(essl): add api reference and doc in markdown (IEC-62)#255

wanckl wants to merge 1 commit intoespressif:masterespressif/idf-extra-components:masterfrom

wanckl:feature/add_markdown_doc_and_api_referencewanckl/idf-extra-components:feature/add_markdown_doc_and_api_referenceCopy head branch name to clipboard