Add a LICENSE chooser during repo/database creation

**Is your feature request related to a problem? Please describe.**
Choosing a LICENSE for data is difficult, and so is creating the LICENSE.md file. The process is described in [your blog post](https://www.dolthub.com/blog/2020-02-11-license-and-readme-in-dolt/), but it is still difficult and slightly time consuming to implement.

**Describe the solution you'd like**
During the repo/database creation wizard, I would like a dropdown that lets you pick a license. After selecting a license, dolthub will create a LICENSE.md file, which will contain the appropriate license contents for the selected license.

I would like the system to work almost exactly how it works on GitHub. Special consideration must be taken to include license that make more sense for data/information, as opposed to code (for example, the MIT License may not be applicable).

**Describe alternatives you've considered**
N/A

**Additional context**
N/A