Add python example to the docs
The documentation should have an example of how to use librsvg from Python. This works; we can probably make it nicer:
import cairo
import gi
gi.require_version('Rsvg', '2.0')
from gi.repository import Rsvg
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 1000, 1000)
cr = cairo.Context(surf)
handle = Rsvg.Handle.new_from_file("hello.svg")
viewport = Rsvg.Rectangle()
viewport.x = 0
viewport.y = 0
viewport.width = 1000
viewport.height = 1000
handle.render_document(cr, viewport)
surf.write_to_png("hello.png")