Add bridges to Metamask

[xf0707]

@skff This should be a similar post

Add bridge to metmask

I highly recommend MetaMask to automatically add bridge functions to the wallet in future plans, so that we can complete the cross-chain of many assets in the wallet at any time, instead of looking for bridges everywhere to use. Such a function is very much needed for deep chain users, and it is very worthwhile to do. Even just be a cross-chain bridge aggregator.