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## Register
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To conveniently check for a given string or document, you will create a register smart contract.
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### Instructions
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Write a solidity smart contract `Register` that provides the following :
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- a function `addDocument()` that takes as parameter a hash (bytes32 in solidity)
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- a function `getDate()` that takes as parameter a hash and returns the corresponding unix timestamp of the document
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```js
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contract Register {
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function getDate(bytes32 documentHash) public view returns (uint) {
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}
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function addDocument(bytes32 documentHash) public {
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}
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}
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```
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### Hint
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You may use block.timestamp to retrieve the current block date and a mapping (see Notions).
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### Notions
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- [Block information](https://docs.soliditylang.org/en/v0.4.21/units-and-global-variables.html#block-and-transaction-properties)
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- [mapping](https://docs.soliditylang.org/en/v0.8.4/types.html#mapping-types)
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