Update readme

README.md

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 # LSP-PowerShellEditorServices
 
-This is a work-in-progress convenience plugin. Most notably the server settings
-are not finished.
+Convenience plugin to install and run the PowerShellEditorServices language server.
+
+To use this package, install the [LSP](https://packagecontrol.io/packages/LSP) 
+package, and the [PowerShell](https://packagecontrol.io/packages/PowerShell) package
+for syntax highlighting. Alternatively, you may use Michael Blyons'
+[PowerShell syntax rewrite](https://github.com/michaelblyons/PowerShell/tree/sublime-syntax).
+
+This package will download binaries in Sublime Text's `$DATA/Cache` directory.