document how to deploy erc20 token

[siosw]

Goals of PR

This PR adds

• documentation on how to deploy ERC20 token pairs on L2
• example script + simple CLI tool (this should eventually be part of SPC i think)
• MintableERC20Factory as predeploy contract

Example use of CLI

Deploying an L2 version of an L1 ERC20 token

npx ts-node ./scripts/bridge/deployERC20Token.ts --rpc http://127.0.0.1:4011 --name test --symbol TT --address 0x000000000000000000000000000000000000dead

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