update readme

README.md

@@ -1,2 +1,29 @@
 # colors
+
 Color conversion and stuff in TypeScript
+
+## Usage
+
+```ts
+// Deno
+import { Color } from "https://deno.land/x/colors/mod.ts";
+
+// Web
+import { Color } from "https://deno.land/x/colors/dist/color.js";
+
+const color = new Color("#fceff1");
+
+// Grayscale version of color
+console.log(color.grayscale);
+
+// CIE XYZ color space
+console.log(color.xyz);
+
+// CIE LAB color space
+console.log(color.lab);
+
+// Conversion of color into all supported spaces
+console.log(color.toJSON());
+```
+
+Refer [https://deno.land/x/colors/mod.ts] for documentation.