add function to display base64 png image (#63)

Author: KarthikRIyer

EnableIPythonDisplay.swift

@@ -80,3 +80,10 @@ extension PythonObject {
 }
 
 IPythonDisplay.enable()
+
+func display(base64Png: String) {
+  let displayImage = Python.import("IPython.display")
+  let codecs = Python.import("codecs")
+  let imageData = codecs.decode(Python.bytes(base64Png, encoding: "utf8"), encoding: "base64")
+  displayImage.Image(data: imageData, format: "png").display()
+}