How do I make a line in rhinocommon?
In RhinoCommon, you can create a line using the `Line` class. Here's an example code snippet to create a line between two points:

```
using Rhino.Geometry;

// Create two points to define the line
Point3d start = new Point3d(0, 0, 0);
Point3d end = new Point3d(5, 5, 5);

// Create a new line using the start and end points
Line myLine = new Line(start, end);

// You can then use the myLine object for further operations
```
In this example, `start` and `end` are two `Point3d` objects that define the start and end points of the line. These points are used to create a new `Line` object called `myLine`. You can then use the `myLine` object for further operations, such as adding it to a Rhino document.