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Add notes on reentrancy

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Smart-Contract-Security/reentrancy-notes.md
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## Notes on Reentrancy
## Reentrancy
<br>
* When a contract calls an external function, that external function may itself call the calling function.
* To prevent this attack, a contract can implement a lock in storage that prevents re-entrant calls.
<br>
### References to learn about reentrancy
<br>
* [Solidity docs](https://docs.soliditylang.org/en/latest/security-considerations.html#re-entrancy)
* [DASP](https://www.dasp.co/#item-1)
* [SWC](https://swcregistry.io/docs/SWC-107)
* [Not so smart contract](https://github.com/crytic/not-so-smart-contracts/tree/master/reentrancy)