Add tasks for all the new languages

Task/Polymorphic-copy/Nim/polymorphic-copy.nim

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+type
+  T = ref object of TObject
+    myValue: string
+  S1 = ref object of T
+  S2 = ref object of T
+
+method speak(x: T)  = echo "T Hello ", x.myValue
+method speak(x: S1) = echo "S1 Meow ", x.myValue
+method speak(x: S2) = echo "S2 Woof ", x.myValue
+
+echo "creating initial objects of types S1, S2, and T"
+var a = S1(myValue: "Green")
+a.speak
+var b = S2(myValue: "Blue")
+b.speak
+var u = T(myValue: "Blue")
+u.speak
+
+echo "Making copy of a as u, colors and types should match"
+u.deepCopy(a)
+u.speak
+a.speak
+
+echo "Assigning new color to u, A's color should be unchanged."
+u.myValue = "Orange"
+u.speak
+a.speak
+
+echo "Assigning u to reference same object as b, colors and types should match"
+u = b
+u.speak
+b.speak
+
+echo "Assigning new color to u. Since u,b references same object b's color changes as well"
+u.myValue = "Yellow"
+u.speak
+b.speak