Add ERC-7715 concept page #807

Job	Run time
Check for case being inconsistent (docs)	14s
Build	8m 57s
Lint Code Base	1m 24s
Spelling (.mdx)	55s
Link Checking (.mdx)	23s
Link Checking (.md)	18s
Spelling (.md)	38s
	12m 49s

Provide feedback