* adding mnz logo binary file
* adding mnz icons json files
for both testnet and mainnet
* adding mnz chains json
for both testnet and mainnet
* fixed explorer URL
* fixed the name
MNZ to MainnetZ
* fixed the name
MNZ to MainnetZ
* added Sardis bin logo
* added sardis icons json files
for both mainnet & testnet
* added sardis chains json files
for both mainnet & testnet
* renamed symbol to NetZ
* renamed symbol to NetZ
* added soverun icon bin file
* added soverun icons json
for both Soverun mainnet & testnet
* added Soverun chains json files
for both Soverun mainnet & testnet
