chore: add README.md

Author: baliestri

README.md

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+<p align="center">
+  <a href="#gh-dark-mode-only" target="_blank" rel="noopener noreferrer">
+    <img src=".github/assets/night.svg" alt="git-extra-profiles.plugin.zsh">
+  </a>
+
+  <a href="#gh-light-mode-only" target="_blank" rel="noopener noreferrer">
+    <img src=".github/assets/day.svg" alt="git-extra-profiles.plugin.zsh">
+  </a>
+</p>
+
+Plugin for managing multiple `git` profiles.
+
+![](.github/assets/preview.gif)
+
+## Installation
+
+### Using [oh-my-zsh](https://github.com/ohmyzsh/ohmyzsh)
+
+```sh
+git clone https://github.com/baliestri/git-profiles.plugin.zsh.git $ZSH_CUSTOM/plugins/git-profiles
+```
+
+Then add `git-profiles` to the plugins array in your zshrc file:
+
+```sh
+plugins=(... git-profiles)
+```
+
+### Using [zplug](https://github.com/zplug/zplug)
+
+```sh
+zplug "baliestri/git-profiles.plugin.zsh"
+```
+
+### Using [zinit](https://github.com/zdharma-continuum/zinit)
+
+```sh
+zinit light baliestri/git-profiles.plugin.zsh
+```
+
+### Using [zgenom](https://github.com/jandamm/zgenom)
+
+```sh
+zgenom load baliestri/git-profiles.plugin.zsh
+```
+
+### Using [zi](https://github.com/z-shell/zi)
+
+```sh
+zi light baliestri/git-profiles.plugin.zsh
+```
+
+## Usage
+
+### Define where your profiles are stored
+
+```sh
+# ~/.zshrc
+
+export GIT_PROFILES_FILE="$HOME/.config/git/profiles" # Fallback to $HOME/.git-profiles
+```
+
+### Add a new profile
+
+```sh
+# ~/.config/git/profiles
+
+[profile "default"]
+  name = Bruno Sales
+  email = me@baliestri.dev
+  # signingkey = 1234567890
+
+[profile "work"]
+  name = Bruno Sales
+  email = work@baliestri.dev
+  # signingkey = 1234567890
+  path = "/home/baliestri/work"
+```