docs(readme): add powershell installer script for Windows (#2208)

* docs(readme): add powershell installer script for Windows

* docs(readme): simplify Windows installation

Co-authored-by: kylo252 <59826753+kylo252@users.noreply.github.com>

* docs(readme): expand powershell `iex` and `iwr`

* docs(readme): use basic parsing for Powershell Invoke-WebRequest

Co-authored-by: kylo252 <59826753+kylo252@users.noreply.github.com>

README.md

@@ -28,10 +28,16 @@ You can find all the documentation for LunarVim at [lunarvim.org](https://www.lu
 
 Make sure you have the release version of Neovim (0.6.1+).
 
+Linux:
 ```bash
 bash <(curl -s https://raw.githubusercontent.com/lunarvim/lunarvim/master/utils/installer/install.sh)
 ```
 
+Windows (Powershell):
+```powershell
+Invoke-WebRequest https://raw.githubusercontent.com/LunarVim/LunarVim/master/utils/installer/install.ps1 -UseBasicParsing | Invoke-Expression
+```
+
 ## Install Language support
 
 - Enter `:LspInstall` followed by `<TAB>` to see your options for LSP