partial class Examples
{
  public static Result TextJustify(RhinoDoc doc)
  {
    var text_entity = new TextEntity
    {
      Plane = Plane.WorldXY,
      Text = "Hello Rhino!",
      Justification = TextJustification.MiddleCenter,
      FontIndex = doc.Fonts.FindOrCreate("Arial", false, false)
    };

    doc.Objects.AddText(text_entity);
    doc.Views.Redraw();

    return Result.Success;
  }
}

from scriptcontext import doc
from Rhino.Geometry import *

text_entity = TextEntity()
text_entity.Plane = Plane.WorldXY
text_entity.Text = "Hello Rhino!"
text_entity.Justification = TextJustification.MiddleCenter
text_entity.FontIndex = doc.Fonts.FindOrCreate("Arial", False, False)

doc.Objects.AddText(text_entity)
doc.Views.Redraw()