add vim-airline installer

vim-airline/README.md

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+---
+title: vim-airline
+homepage: https://github.com/vim-airline/vim-airline
+tagline: |
+  Lean & mean status/tabline for vim that's light as air.
+---
+
+## Cheat Sheet
+
+> Lean & mean status/tabline for vim that's light as air.
+
+![](https://github.com/vim-airline/vim-airline/wiki/screenshots/demo.gif)
+
+See the [vim-airline-themes](/vim-airline-themes) for additional themes.

vim-airline/install.ps1

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+#!/usr/bin/env pwsh
+
+IF (!(Test-Path -Path "$Env:USERPROFILE\.vim\pack\plugins\start")) {
+    New-Item -Path "$Env:USERPROFILE\.vim\pack\plugins\start" -ItemType Directory -Force | out-null
+}
+Remove-Item -Path "$Env:USERPROFILE\.vim\pack\plugins\start\vim-airline" -Recurse -ErrorAction Ignore
+& git clone --depth=1 https://github.com/vim-airline/vim-airline.git "$Env:USERPROFILE\.vim\pack\plugins\start\vim-airline"

vim-airline/install.sh

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+#!/bin/sh
+
+__init_vim_airline() {
+    set -e
+    set -u
+
+    mkdir -p "$HOME/.vim/pack/plugins/start"
+    rm -rf "$HOME/.vim/pack/plugins/start/vim-airline"
+    git clone --depth=1 https://github.com/vim-airline/vim-airline.git "$HOME/.vim/pack/plugins/start/vim-airline"
+
+    if [ ! -f "$HOME/.vimrc" ]; then
+        touch "$HOME/.vimrc"
+    fi
+
+    mkdir -p ~/.vim/plugins
+    if ! [ -f "$HOME/.vim/plugins/airline.vim" ]; then
+        WEBI_HOST=${WEBI_HOST:-"https://webinstall.dev"}
+        curl -fsSL -o ~/.vim/plugins/airline.vim "$WEBI_HOST/packages/vim-airline/airline.vim"
+    fi
+
+    if ! grep 'source.*plugins.airline.vim' -r ~/.vimrc > /dev/null 2> /dev/null; then
+        set +e
+        mkdir -p ~/.vim/plugins
+        printf '\n" vim-airline: reasonable defaults from webinstall.dev/vim-airline\n' >> ~/.vimrc
+        printf 'source ~/.vim/plugins/airline.vim\n' >> ~/.vimrc
+        set -e
+        echo ""
+        echo "add ~/.vim/plugins/airline.vim"
+        echo "updated ~/.vimrc with 'source ~/.vim/plugins/airline.vim'"
+    fi
+
+    echo ""
+    echo "vim-airline enabled with reasonable defaults"
+}
+
+__init_vim_airline