Implement Uniswap AMM

[gbear605]

Implements an automated market maker using the basic Uniswap algorithm from https://manifoldmarkets.notion.site/Maniswap-ce406e1e897d417cbd491071ea8a0c39.

Currently branched off of https://github.com/casesandberg/play-money/pull/10, so it will need a rebase after that is finished and merged in.

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[gbear605]

One thing that this didn't try to address, but will need to be handled soon, is that the AMM amounts are floats. I think ideally all money should be integer (or perhaps, fixed point decimal).

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[casesandberg]

One thing that this didn't try to address, but will need to be handled soon, is that the AMM amounts are floats. I think ideally all money should be integer (or perhaps, fixed point decimal).

Yeah, likely we want to be using a special decimal datatype instead of number. I did a little digging and decimal.js and bignumber.js seem to be well maintained and pretty popular. Heres a wiki about the differences of them: https://github.com/MikeMcl/big.js/wiki

[casesandberg]

This looks great!!

[casesandberg]

Closes https://github.com/casesandberg/play-money/issues/18