Add Typescript typings

test/index.d.spec.ts

@@ -0,0 +1,19 @@
+import * as numeralize from '../index';
+
+let g: numeralize.Gender;
+g = numeralize.GENDER_MASCULINE;
+g = numeralize.GENDER_FEMININE;
+g = numeralize.GENDER_NEUTER;
+
+let c: numeralize.Case;
+c = numeralize.CASE_NOMINATIVE;
+c = numeralize.CASE_GENITIVE;
+c = numeralize.CASE_DATIVE;
+c = numeralize.CASE_ACCUSATIVE;
+c = numeralize.CASE_INSTRUMENTAL;
+c = numeralize.CASE_PREPOSITIONAL;
+
+let s: string;
+s = numeralize(123, g, c, true);
+s = numeralize.pluralize(123, 'рубль', 'рубля', 'рублей');
+