Add eclipse-jdt-ls installer

installer/install-eclipse-jdt-ls.cmd

@@ -0,0 +1,27 @@
+@echo off
+
+cd %~dp0
+if exist "..\servers\eclipse-jdt-ls" rd /S /Q  "..\servers\eclipse-jdt-ls"
+md "..\servers\eclipse-jdt-ls"
+cd "..\servers\eclipse-jdt-ls"
+curl -o "jdt-language-server-latest.tar.gz" "http://download.eclipse.org/jdtls/snapshots/jdt-language-server-latest.tar.gz"
+curl -o "lombok.jar" "https://projectlombok.org/downloads/lombok.jar"
+copy ..\..\installer\jdt-language-server-latest.tar.gz > NUL
+tar xvf jdt-language-server-latest.tar.gz
+del jdt-language-server-latest.tar.gz
+
+echo @echo off ^
+
+setlocal enabledelayedexpansion ^
+
+cd %%~dp0 ^
+
+for %%%%F in (plugins/org.eclipse.equinox.launcher*.jar) do ( ^
+
+  set launcher=plugins/%%%%F ^
+
+) ^
+
+java -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Dlog.protocol=true -Dlog.level=ALL -noverify -Xmx1G -javaagent:%%~dp0/lombok.jar -Xbootclasspath/a:%%~dp0/lombok.jar -jar %%~dp0\!launcher! -configuration %%~dp0\config_win -data %%~dp0\data ^
+
+> eclipse-jdt-ls.cmd