📚 Update README.md

README.md

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 # ayu-iTerm
-ayu color theme for iTerm
+> [ayu color theme](https://github.com/ayu-theme) for [iTerm2](https://www.iterm2.com/)
+
+
+## Screenshots
+* ayu Light
+![ayu-Light](./img/ayu-Light.png)
+
+* ayu Mirage
+![ayu-Mirage](./img/ayu-Mirage.png)
+
+* ayu Dark
+![ayu-Dark](./img/ayu-Dark.png)
+
+
+## How to install
+1. _iTerm_ > `Preferences` > `Profiles` > `Colors` Tab
+2. Open the `Color Presets...` drop-down in the bottom right corner
+3. Select `Import...` from the list
+4. Select the `itermcolors` file
+5. Select the ayu-Light | ayu-Mirage | ayu-Dark from `Color Presets...`