run npm install to install all the required packages
run npm start from root directory to start the react project
Replace the token addresses in src/config.json with your corresponding token addresses
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posRootERC20 : ERC20 root token address on pos bridge 
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posChildERC20 : ERC20 child token address on pos bridge 
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posWETH : PoS Weth 
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rootChainWETH: WETH deployed on root chain 
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plasmaWETH : Plasma WETH 
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plasmaRootERC20 : ERC20 root token deployed on plasma 
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plasmaChildERC20 : ERC20 child token deployed on plasma 
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MATIC_RPC": RPC for child chain, 
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"ETHEREUM_RPC": RPC for root chain, 
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"VERSION": network version, 
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"NETWORK": "testnet" or "mainnet" 
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"MATIC_CHAINID": Chain ID of child chain, 
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"ETHEREUM_CHAINID": Chain ID of root chain 
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The corresponding configuration and key values for matic mainnet and mumbai testnet can be found here https://static.matic.network/network/testnet/mumbai/index.json https://static.matic.network/network/mainnet/v1/index.json