Initial data commit

Task/Factorial/Elixir/factorial.elixir

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+defmodule Factorial do
+  # Simple recursive function
+  def fac(0), do: 1
+  def fac(n) when n > 0, do: n * fac(n - 1)
+
+  # Tail recursive function
+  def fac_tail(0), do: 1
+  def fac_tail(n), do: fac_tail(n, 1)
+  def fac_tail(1, acc), do: acc
+  def fac_tail(n, acc) when n > 1, do: fac_tail(n - 1, acc * n)
+
+  # Tail recursive function with default parameter
+  def fac_default(n, acc \\ 1)
+  def fac_default(0, acc), do: acc
+  def fac_default(n, acc) when n > 0, do: fac_default(n - 1, acc * n)
+
+  # Using Enumeration features
+  def fac_reduce(0), do: 1
+  def fac_reduce(n) when n > 0, do: Enum.reduce(1..n, 1, &*/2)
+
+  # Using Enumeration features with pipe operator
+  def fac_pipe(0), do: 1
+  def fac_pipe(n) when n > 0, do: 1..n |> Enum.reduce(1, &*/2)
+
+end