readme prerequisites steps

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Color and Black-and-White Noto emoji fonts, and tools for working with them.
## Prerequisites
- This project uses Python 3.
- You need either [zopflipng](https://github.com/google/zopfli) or [optipng](ttp://optipng.sourceforge.net/). (Zopflipng is better (about 5-10%) but much slower.)
- You need [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/)
- You need [pngquant](https://pngquant.org/)
Building Noto Color Emoji requires:
- Python 3
- [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/)
- [pngquant](https://pngquant.org/)
- Either [zopflipng](https://github.com/google/zopfli) or [optipng](http://optipng.sourceforge.net/). Zopflipng is better (about 5-10%) but much slower.
## Building NotoColorEmoji
This project uses a virtual environment to manage dependencies. Use the following steps to get up and running.