Add list_distributions example to repo readme

[nlinton]

As a user, if I want to use the package I first need an accessible way to see if the disease I am working on has any entry, how many entries there are for that disease, etc. (I.e. see what my options are). It took some digging to find the list_distributions function that had what I was looking for. It would be great if you added the list_distributions example to the repo readme so it is easier for users to find.

[nlinton]

It would also be immensely helpful for list_distributions to output pathogen as the second column.

[joshwlambert]

@nlinton Thank you for your suggestions. I will work on improving the README and adding the pathogen column.

Also just to add, the list_distributions() function will likely be renamed to parameter_tbl() as the current name is a little misleading about the return type.

[nlinton]

Sounds good, and thanks for the heads up!

[joshwlambert]

@nlinton apologies for the slow response and getting these changes merged into the main branch. There is a pull request (#321) open now which include the changes you've requested and will be merged later today. The issue will close once the PR is merged.

If the changes are not exactly what you were after, or you'd like to make another request please feel free to reopen this issue or open a new issue.

Thanks for the input to improve the package!