wip(growth): add score module

This module is responsible for calculate the z score/centile for each
measurement.

lib/growth/score/arm_circumference.ex

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+defmodule Growth.Score.ArmCircumference do
+  @moduledoc """
+  Calculate z-score for arm circumference for age.
+  """
+end

lib/growth/score/bmi.ex

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+defmodule Growth.Score.BMI do
+  @moduledoc """
+  Calculate z-score for body mass index for age.
+  """
+end

lib/growth/score/head_circumference.ex

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+defmodule Growth.Score.HeadCircumference do
+  @moduledoc """
+  Calculate z-score for head circumference for age.
+  """
+end

lib/growth/score/height.ex

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+defmodule Growth.Score.Height do
+  @moduledoc """
+  Calculate z-score for height for age.
+  """
+end

lib/growth/score/subscapular_skinfold.ex

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+defmodule Growth.Score.SubscapularSkinfold do
+  @moduledoc """
+  Calculate z-score for subscapular skinfold for age.
+  """
+end

lib/growth/score/triceps_skinfold.ex

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+defmodule Growth.Score.TricepsSkinfold do
+  @moduledoc """
+  Calculate z-score for triceps skinfold for age.
+  """
+end

lib/growth/score/weight.ex

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+defmodule Growth.Score.Weight do
+  @moduledoc """
+  Calculate z-score for weight for age.
+  """
+end

lib/growth/score/weight_for_height.ex

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+defmodule Growth.Score.WeightForHeight do
+  @moduledoc """
+  Calculate z-score for weight for height.
+  """
+end