Add level description - Climber

Author: nicolasgarcia214

test/Levels/climber/README.md

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+# Challenge #12 - Climber
+There's a secure vault contract guarding 10 million DVT tokens. The vault is upgradeable, following the [UUPS pattern](https://eips.ethereum.org/EIPS/eip-1822).
+
+The owner of the vault, currently a timelock contract, can withdraw a very limited amount of tokens every 15 days.
+
+On the vault there's an additional role with powers to sweep all tokens in case of an emergency.
+
+On the timelock, only an account with a "Proposer" role can schedule actions that can be executed 1 hour later.
+
+Your goal is to empty the vault.
+
+[See the contracts](https://github.com/nicolasgarcia214/damn-vulnerable-defi-foundry/tree/master/src/Contracts/climber)
+<br/>
+[Complete the challenge](https://github.com/nicolasgarcia214/damn-vulnerable-defi-foundry/blob/master/test/Levels/climber/Climber.t.sol)