`distribution.Rd`

Currently, this function makes a distribution object with nothing in it. The idea is that you can then set things downstream, with functions such as set_cdf() and set_mean(). The idea behind this function is expected to be in flux.

```
is_distribution(object)
is.distribution(object)
distribution(variable = c("continuous", "discrete", "mixed"))
```

- object
Object to be tested

- variable
Is this variable continuous, discrete, or mixed?

A distribution object with nothing in it.