setup key bindings for cmp

after/plugin/cmp.lua

@@ -2,6 +2,13 @@ require("cmp_git").setup()
 local cmp = require("cmp")
 
 cmp.setup({
+  mapping = {
+    ["<C-k>"] = cmp.mapping.select_prev_item(),
+    ["<C-j>"] = cmp.mapping.select_next_item(),
+    ["<C-space>"] = cmp.mapping.complete(),
+    ["<C-q>"] = cmp.mapping.close(),
+    ["<Tab>"] = cmp.mapping.confirm({ select = true }),
+  },
   snippet = {
     expand = function(args)
       require("luasnip").lsp_expand(args.body)