Create abstract class Transform2D and its subclasses AffineTransform2D and JuliaTransform

These classes perform the transformations needed to produce fractals.

.idea/vcs.xml

@@ -8,5 +8,6 @@
   </component>
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/idatt2003" vcs="Git" />
   </component>
 </project>
\ No newline at end of file