Add installer

installer/install-gopls.cmd

@@ -9,4 +9,4 @@ cd "..\servers\gopls"
 set GOPATH=%cd%
 set GOBIN=%cd%
 go get -v -u golang.org/x/tools/cmd/gopls
-rd /S /Q  "src"
+rd /S /Q "src"

installer/install-rls.cmd

@@ -0,0 +1,15 @@
+@echo off
+
+setlocal
+
+cd %~dp0
+if exist "..\servers\rls" rd /S /Q  "..\servers\rls"
+md "..\servers\rls"
+cd "..\servers\rls"
+set CARGO_HOME=%cd%
+cargo install rls
+copy bin\rls.exe .
+rd /S /Q "bin"
+rd /S /Q "registry"
+del .package-cache
+del .crates.toml

installer/install-rls.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+[ -d ../servers/rls ] && rm -rf ../servers/rls
+mkdir ../servers/rls
+cd ../servers/rls
+CARGO_HOME=$(pwd) cargo install rls 
+cp bin/rls .
+rm -rf bin registry .package-cache .crates.toml