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Proposal for token-swap curve using stake pool account (#1504) 

* feat: add new curve proposal

* Update StakePoolStableCurve.md
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# Combine Stable Curve with Stake Pool for price discovery
Implement a curve for token-swap that accepts stake pool account and uses stable curve to swap assets.
[Stake pool account](https://github.com/solana-labs/solana-program-library/blob/master/stake-pool/program/src/state.rs#L17) will be used for initial price discovery then stable curve would be used to derive price based on the size of the order and available reserves.
## Links
1. Stake pool implementation: https://github.com/solana-labs/solana-program-library/blob/master/stake-pool/program
2. AMM implementation: https://github.com/solana-labs/solana-program-library/blob/master/token-swap/program
3. Stable curve: https://github.com/solana-labs/solana-program-library/blob/master/token-swap/program/src/curve/stable.rs