feat(ratios): add ratios

src/index.js

@@ -13,3 +13,23 @@ export { toSnakeCase } from './convertors/to-snake-case';
 export { isNumeric } from './helpers/is-numeric';
 export type { BreakpointsMap, Breakpoint } from './models/breakpoints';
 export type { UserConfig } from './models/user-config';
+
+export const ratios = {
+  AUGMENTED_FOURTH: 1.41421,
+  DOUBLE_OCTAVE: 4,
+  GOLDEN_SECTION: 1.618034,
+  MAJOR_ELEVENTH: 2.666666667,
+  MAJOR_SECOND: 1.125,
+  MAJOR_SEVENTH: 1.875,
+  MAJOR_SIXTH: 1.666666667,
+  MAJOR_TENTH: 2.5,
+  MAJOR_THIRD: 1.25,
+  MAJOR_TWELFTH: 3,
+  MINOR_SECOND: 1.066666667,
+  MINOR_SEVENTH: 1.777777778,
+  MINOR_THIRD: 1.2,
+  OCTAVE: 2,
+  PERFECT_FIFTH: 1.5,
+  PERFECT_FOURTH: 1.333333333,
+  PHI: 1.618034,
+};