* Adding binance smart chain private network genesis

Author: mohamedelshami

devnet/README.md

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+# BSC Private Network Setup
+
+This directory contains instructions and genesis private Binance Smart Chain testnet equivalent.
+
+## Preparation
+
+1. Create genesis
+````shell
+./bsc/build/bin/geth init --datadir node1 devnet/genesis.json
+```` 
+2. Start signer node
+````shell
+./bsc/build/bin/geth --datadir node1 --syncmode 'full' --port 30312 --rpc --rpcaddr 'localhost' --rpccorsdomain "*" --rpcport 8545 --ws --wsport 8546 --rpcapi 'personal,eth,net,web3,txpool,miner' --networkid 97 --gasprice '1' --unlock '0x48948297C3236ec3eA6c95f4eEc22fDb18255E55' --password pass.txt --mine --allow-insecure-unlock
+```` 
+