Añado documentación de vercel #44

docs/vercel.md

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+# VERCEL
+
+To deploy my repository in Vercel I stuck to the [official documentation](https://vercel.com/docs/platform/deployments).
+
+First you have to athorize Vercel to access your GitHub account then you choose which project you want to import
+
+![](/img/vercel.png)
+
+Then we can choose which folders we want to import. It may looks like choosing everything is not the best choice but the functions probably need to access others directories.
+
+Finally, in order to make the deployment:
+
+- To make a deplyment preview:
+~~~
+$ vercel
+~~~
+
+- To make a production deployment_
+~~~
+$ vercel --prod
+~~~
+
+Now with every push to my repository Vercel is going to be launch aswell
+
+## Creating a function
+
+Vercel builds functions within the '/api' directory.To work it must export a default function handler.
+
+I'm going to implement a function to see which item is the cheaper one.It is user story 6.
+
+
+![](/img/vercelf.png)
+
+The function Price gets every price of the data and it save the lower price. It is a very simple function that works fine.
+
+
+Additionally I have created a file with the [data](https://github.com/miguelfdez99/MyOutlet/blob/master/api/data.js)