Merge pull request #71 from jmcook1186/master

add deprecation notice in advance of archiving repo

README.md

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+# Eth.wiki
+
+:no_entry_sign: **no longer actively maintained** :no_entry_sign:
+
+Eth.wiki is a now largely outdated collection of resources explaining the state-of-the-art in Ethereum circa 2020.
+
+The material in this repository has been updated and migrated to ethereum.org.
+
+This repository is due to be archived shortly. Please visit ethereum.org instead for current Ethereum information!
+
+Looking to contribute to Ethereum documentation? Check out the ethereum.org repo: https://github.com/ethereum/ethereum-org-website