Add tasks for all the new languages

Task/Constrained-genericity/Nim/constrained-genericity.nim

@@ -0,0 +1,21 @@
+type
+  Eatable = generic e
+    eat(e)
+
+  FoodBox[e: Eatable] = seq[e]
+
+  Food = object
+    name: string
+    count: int
+
+proc eat(x: int) = echo "Eating the int: ", x
+proc eat(x: Food) = echo "Eating ", x.count, " ", x.name, "s"
+
+var ints = FoodBox[int](@[1,2,3,4,5])
+var fs = FoodBox[Food](@[])
+
+fs.add Food(name: "Hamburger", count: 3)
+fs.add Food(name: "Cheeseburger", count: 5)
+
+for f in fs:
+  eat(f)