feat: add type definitions;

- Closes #10

index.d.ts

@@ -0,0 +1,8 @@
+declare module 'tinydate' {
+	type Defaults = 'YYYY' | 'YY' | 'MM' | 'DD' | 'HH' | 'mm' | 'ss' | 'fff';
+	export type Formatter = (date: Date) => string | number;
+	export type Dictionary = Record<Defaults | string, Formatter>;
+
+	function tinydate(template: string, dict?: Dictionary): (date?: Date) => string;
+	export = tinydate;
+}

package.json

@@ -6,6 +6,7 @@
   "unpkg": "dist/tinydate.min.js",
   "module": "dist/tinydate.mjs",
   "main": "dist/tinydate.js",
+  "types": "index.d.ts",
   "license": "MIT",
   "author": {
     "name": "Luke Edwards",
@@ -23,7 +24,8 @@
     "test": "tape test/*.js | tap-spec"
   },
   "files": [
-    "dist"
+    "dist",
+    "*.d.ts"
   ],
   "keywords": [
     "date",