Add tasks for all the new languages

Task/Enumerations/Nim/enumerations.nim

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+type Fruits = enum Apple, Banana, Cherry
+
+type Fruits = enum Apple = 0, Banana = 1, Cherry = 2 # with values
+
+type Fruits {.pure.} = enum Apple, Banana, Cherry # scoped enum
+var i: int = Apple # error for scoped enum
+
+type Fruits = enum Apple = "Apple", Banana = "Banana", Cherry = "Cherry" # with string literals