Missing license?

[alexholdenmiller]

I noticed that your main repo has an MIT license but this repo seems to be missing one. Is this code also available under the MIT license? It would be lovely if the license were copied over to this repo too.

[YangletLiu]

Per your suggestion, an MIT license file has been added.
Recently, our team will spend more time on maintaining the tutorials, helping users to get familiar with FinRL.