add todo comments and jsonls config

lsp/jsonls.lua

@@ -0,0 +1,19 @@
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities.textDocument.completion.completionItem.snippetSupport = true
+
+return {
+    cmd = { "vscode-json-language-server", "--stdio" },
+    filetypes = { "json", "jsonc" },
+
+    capabilities = capabilities,
+    init_options = {
+        provideFormatter = true
+    },
+    single_file_support = true,
+    settings = {
+        json = {
+            schemas = require('schemastore').json.schemas(),
+            validate = { enable = true },
+        },
+    },
+}