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Adds a column when creating or altering a table.

## Examples

    create table(:posts) do
      add :title, :string, default: "Untitled"

    alter table(:posts) do
      add :summary, :text

## Options

  * `:default` - the column's default value.
  * `:primary_key` - when true, marks this field as the primary key
  * `:null` - when `false`, the column does not allow null values.
  * `:size` - the size of the type (for example the numbers of characters). Default is no size.
  * `:precision` - the precision for a numberic type. Default is no precision.
  * `:scale` - the scale of a numberic type. Default is 0 scale.
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