some nvim updates

.config/nvim/lua/plugins/completion.lua

@@ -0,0 +1,11 @@
+-- Autocompletion system
+return {
+  "hrsh7th/nvim-cmp",
+  dependencies = {
+    "hrsh7th/cmp-nvim-lsp", -- LSP source for nvim-cmp
+    "hrsh7th/cmp-buffer",   -- Buffer source
+    "hrsh7th/cmp-path",     -- Path source
+    "L3MON4D3/LuaSnip",     -- Snippet engine
+    "saadparwaiz1/cmp_luasnip", -- Snippet source
+  },
+}