Add lsp for java

lsp/java-lsp.lua

@@ -0,0 +1,7 @@
+-- Install jdtls by hand, then use this
+-- https://github.com/eclipse-jdtls/eclipse.jdt.ls
+return {
+  filetypes = { "java" },
+  cmd = { "jdtls" },
+  root_markers = { ".git" },
+}