Add more details to the readme file

Author: danburzo

.gitignore

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 *.sublime-workspace
 .DS_Store
 build/
+bundled/
 node_modules
 *.log
 .nyc_output/

README.md

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 <a href="https://www.npmjs.org/package/culori"><img src="https://img.shields.io/npm/v/culori.svg?style=flat-square&labelColor=d84f4c&color=black" alt="npm version"></a> <a href="https://bundlephobia.com/result?p=culori"><img src="https://img.shields.io/bundlephobia/minzip/culori?style=flat-square&labelColor=d84f4c&color=black" alt="bundle size"></a>
 
-Culori is a color library for JavaScript that works across many color spaces to offer conversion, interpolation, color difference formulas, blending functions, and more.
+Culori is a comprehensive color library for JavaScript that works across many color spaces to offer conversion, interpolation, color difference formulas, blending functions, and more. It provides up-to-date support for the color spaces defined in [CSS Color Module Level 4](https://drafts.csswg.org/css-color/) specification.
+
+The full documentation is published on [culorijs.org](https://culorijs.org). Some quick entry points:
+
+-   [Getting started](https://culorijs.org/getting-started)
+-   [API References](https://culorijs.org/api/)
+-   [Supported color spaces](https://culorijs.org/color-spaces/)
+
+## Development
+
+The 0.x branch:
 
 ```bash
 npm install culori
 ```
 
-[Read the documentation](https://culorijs.org)
+[The 1.x branch](https://github.com/Evercoder/culori/pull/139), currently in development, uses the `next` tag:
+
+```bash
+npm install culori@next
+```
+
+## Contributing
+
+Contributions of any kind (feedback, ideas, bug fixes) are welcome. Please open a GitHub issue before starting work on anything that's not straightforward.