Add unmaintained notice

README.md

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+[![No Maintenance Intended](http://unmaintained.tech/badge.svg)](http://unmaintained.tech/)
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+# NO LONGER MAINTAINED
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+Since the launch of Kaia Blockchain this repository has been parked in favour of the new open-source projects in [Kaia's Github](https://github.com/kaiachain). Contributors have now moved there continuing with massive open-source contributions to our blockchain ecosystem. A big thank you to everyone who has contributed to this repository. For more information about Klaytn's chain merge with Finschia blockchain please refer to the launching of Kaia blockchain - [kaia.io](http://kaia.io/).
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 # Klaytn Contracts
 
 [![Docs](https://img.shields.io/badge/docs-%F0%9F%93%84-blue)](https://docs.klaytn.foundation/)