docs: add readme and screenshot

README.md

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+<h1 align="center">
+  <br>
+  <img src="https://storage.googleapis.com/golden-wind/github/omni/omni.png" alt="Omni Logo" width="100">
+  <br>
+  Omni for <a href="https://iterm2.com">iTerm2</a>
+  <br>
+</h1>
+
+<p align="center">
+  <strong>Dark theme for <a href="https://iterm2.com">iTerm2</a></strong>
+</p>
+
+<p align="center">
+  <img src="https://img.shields.io/badge/PRs-welcome-%235FCC6F.svg" alt="PRs welcome!" />
+
+  <img alt="License" src="https://img.shields.io/badge/license-MIT-%235FCC6F">
+</p>
+
+<p align="center">
+  <a href="#install">Install</a> •
+  <a href="#team">Team</a> •
+  <a href="#license">License</a>
+</p>
+
+<p align="center">
+  <img alt="Omni screnshoot for iTerm2" src="./screenshot.png">
+</p>
+
+## Install
+
+All instructions can be found at [INSTALL.md](./INSTALL.md).
+
+## Team
+
+This theme is maintained by the following person(s) and a bunch of [awesome contributors](https://github.com/demartini/iterm/graphs/contributors).
+
+| [![Iolar Demartini Junior](https://github.com/demartini.png?size=100)](https://github.com/demartini) |
+| ---------------------------------------------------------------------------------------------------- |
+| [Iolar Demartini Junior](https://github.com/demartini)                                               |
+
+## License
+
+[MIT License](./LICENSE.md)