feat: new config with everything manually installed

lsp/jdtls.lua

@@ -0,0 +1,5 @@
+return {
+    cmd = { 'jdtls' },
+    filetypes = { 'java' },
+    root_markers = { 'pom.xml', 'build.gradle', '.git', 'mvnw', 'gradlew' },
+}