feat: autoload and install volta

LICENSE

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+MIT License
+
+Copyright © 2020 ri7nz
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# ZSH Plugin - Volta
+ZSH Plugin to install and load [**Volta: JS Toolchains as Code. ⚡**](https://github.com/volta-cli/volta)
+
+## Table of Content
+<!-- vim-markdown-toc GFM -->
+
+* [Installation](#installation)
+  * [Zinit](#zinit)
+  * [Zplug](#zplug)
+* [Similar Projects](#similar-projects)
+
+<!-- vim-markdown-toc -->
+## Installation
+
+### Zinit
+```zsh
+zinit light "ri7nz/zsh-volta"
+```
+
+### Zplug
+```zsh
+zplug "ri7nz/zsh-volta"
+```
+
+## Similar Projects
+- [**zsh-yarn**](https://github.com/ri7nz/zsh-yarn)
+- [**zsh-fnm**](https://github.com/dominik-schwabe/zsh-fnm)
+- [**zsh-nvm**](https://github.com/lukechilds/zsh-nvm)

zsh-volta.plugin.zsh

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+command -v volta &>/dev/null || {
+  print -P "%F{33}▓▒░ %F{34}checking %F{33}Volta%F{220}...%f"
+  export VOLTA_HOME="$HOME/.volta"
+  export PATH="$VOLTA_HOME/bin:$PATH"
+  command -v volta &>/dev/null || {
+    print -P "%F{33}▓▒░ %F{220}Installing %F{33}Volta%F{220}…%f"
+    curl -fsSL https://get.volta.sh | bash
+    print -P "%F{33}▓▒░ %F{34} ✅ %F{33}Volta%F{220} installation succeeded %f%b"
+  }
+  print -P "%F{33}Volta%F{220} was installed in %F{160}$VOLTA_HOME%F{220}%f%b"
+}