feat: Turtle.get_Maximum ( Fixes #10 )

Author: James Brundage

Types/Turtle/get_Maximum.ps1

@@ -0,0 +1,12 @@
+<#
+.SYNOPSIS
+    Gets the turtle maximum point.
+.DESCRIPTION
+    Gets the maximum point reached by the turtle.
+
+    Keeping track of this as we go is far more efficient than calculating it from the path.
+#>
+if ($this.'.Maximum') {
+    return $this.'.Maximum'
+}
+return ([pscustomobject]@{ X = 0; Y = 0 })