Add Nym's Nyx blockchain 
Nym is creating a smart contract network called Nyx: https://blog.nymtech.net/nym-now-supports-smart-contracts-2186da46bc7f?gi=8e7c120042d2

Suggest adding to this section of the Readme: https://github.com/Mikerah/awesome-privacy-on-blockchains#blockchains-with-private-smart-contracts

Or this section: https://github.com/Mikerah/awesome-privacy-on-blockchains#network-layer-privacy-for-blockchains