## hash-file
### Instructions
Create a function `hashFile(fpath)` that given the name of a file in the current folder, expected to be a string, returns the hash `sha256` of the content of this file as a string.
Here an example on how you should make your function used from external scripts:
```js
exports.hasFile = ...
```
### Usage
Here below an example of `main.js` script to test the usage of the `hashFile` function:
```js
const hash = await hashFile('textfile.txt')
console.log(hash)
```
And its usage:
```console
$ cat textfile.txt
Sometimes science is more art than science.$
Sometimes science is more art than science.
$ node main.js
bd9ecabfb0c9a310cbca5ef1dd6456486236ba58a1d8a4eaf2b0a40283525cd9
$
```
### Notions
- [Node.js _crypto_ hash ](https://nodejs.org/docs/latest-v14.x/api/crypto.html#crypto_class_hash )
- [Node.js _fs.readFile_ ](https://nodejs.org/api/fs.html#filehandlereadfileoptions )
- [Wikipedia: Hash_function ](https://en.wikipedia.org/wiki/Hash_function )
