API improvement, Image and vehicle [Back-end]

- [ ] Update the API so we can load an image file to the vehicles:

![image](https://user-images.githubusercontent.com/55507343/213828344-06b23aef-5840-499b-8af6-2ece11496f85.png)

- [ ] Add vehicles description:

![image](https://user-images.githubusercontent.com/55507343/213829348-072f5eae-de63-4a35-a47c-be5f99bf2118.png)

