switch config

vim-neovim/switching-configs.md

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+# Switching configs in Neovim
+
+## 1. Problem
+
+Learning how to configure Neovim can be overwhelming, meanwhile there are so many nice and functional pre-built configurations ([LazyVim](https://www.lazyvim.org/), [NvChad](https://nvchad.com/), [AstroNvim](https://astronvim.com/), [LunarVim](https://www.lunarvim.org/) or [kickstart](https://github.com/nvim-lua/kickstart.nvim)). Just try them and see what fits you most.
+
+But the problem is most installation instructions will tell you to install new configurations directly to `~/.config/nvim`, once you do, you lose the previous config. You can only have onee Neovim config installed at a time.
+
+## 2. Solution
+
+To be able to use more than one config:
+- Install the pre-built configurations to custom `~/.config` subdirectory.
+
+```shell
+git clone https://github.com/nvim-lua/kickstart.nvim.git "${XDG_CONFIG_HOME:-$HOME/.config}"/nvim-kickstart
+```
+
+- Each time you open Neovim, specify which config you want by setting the `NVIM_APPNAME` environment variable.
+
+```shell
+NVIM_APPNAME=nvim-kickstart nvim
+```
+
+Neovim uses `NVIM_APPNAME` to determine which config directory to load. If you don’t include it (or set it to an invalid value), Neovim will use the default config in `~/.config/nvim`.
+
+## 3. Furthermore
+
+Typing `NVIM_APP=` everytime you use nvim is tiring. You can use `alias` or `select` to reduce tiredness.