Add installer

installer/install-javascript-typescript-langserver.cmd

@@ -0,0 +1,16 @@
+@echo off
+
+cd %~dp0
+if exist "..\servers\javascript-typescript-langserver" rd /S /Q  "..\servers\javascript-typescript-langserver"
+md "..\servers\javascript-typescript-langserver"
+cd "..\servers\javascript-typescript-langserver"
+git clone https://github.com/sourcegraph/javascript-typescript-langserver .
+npm install
+npm build
+
+echo @echo off ^
+
+node %%~dp0\lib\language-server-stdio.js ^
+
+> javascript-typescript-langserver.cmd
+

installer/install-javascript-typescript-langserver.sh

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+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+[ -d ../servers/javascript-typescript-langserver ] && rm -rf ../servers/javascript-typescript-langserver
+mkdir ../servers/javascript-typescript-langserver
+cd ../servers/javascript-typescript-langserver
+git clone https://github.com/sourcegraph/javascript-typescript-langserver .
+npm install
+npm build
+
+cat <<EOF > javascript-typescript-langserver
+#!/bin/sh
+
+DIR=\$(cd \$(dirname \$0); pwd)
+node \$DIR/lib/language-server-stdio.js
+EOF
+
+chmod +x javascript-typescript-langserver