Add token list file for Uniswap

[vincen7su]

I create a mAsset token list gist according to the doc.
Feel free to copy and modify.
https://gist.github.com/vincen7su/a42e72eedf490174a9d759968ade816c

Other token list template: https://tokenlists.org/
Token list schema: https://github.com/Uniswap/token-lists
Request add list on Uniswap by creating issue here: https://github.com/Uniswap/tokenlists-org/issues/new?assignees=&labels=list-request&template=add-list-request.md&title=Request%3A+add+%7BList+name%7D

[dokwon]

@vincen7su what's the benefit of creating this token list file?

[vincen7su]

@dokwon User doesn't have to add token contract to their list one by one. This also prevent user from trading fake token on Uniswap.

[dokwon]

@simcheolhwan - for your attention. @vincen7su - thanks for flagging.

[simcheolhwan]

Thank you for your work.

We have already sent our Wraped Mirror assets one by one to Uniswap default token list.
Based on the list you made, We will send PR to tokenlists.org as well.

I'll let you know the details again.

We considered whether to add a link to mETH to allow users to download this file, but the team decided not to do so.