Add plot to documentation

packages/website/docs/Api/Plot.md

@@ -0,0 +1,19 @@
+---
+sidebar_position: 8
+title: Plot
+---
+
+Plot objects can be created to make plots of different kinds. If you wish to plot
+multiple distributions simultaneously, you can use `Plot.dist`.
+
+**Example**
+
+### dist
+
+```
+Plot.dist({show: list({name: string, value: distribution|number})})
+```
+
+```js
+Plot.dist({show: [{name: "normal", value: normal(0, 1)}, {name: "lognormal", value: 2 to 3}]})
+```