added nvim-cmp for completions

lua/plugins/lsp.lua

@@ -30,14 +30,24 @@ vim.api.nvim_create_autocmd('LspAttach', {
 return {
     {
         "neovim/nvim-lspconfig",
+        dependencies = {
+            "hrsh7th/cmp-nvim-lsp",
+        },
         config = function()
             local lspconfig = require("lspconfig")
 
-            lspconfig.pyright.setup({})
+            local capabilities = require("cmp_nvim_lsp").default_capabilities();
 
-            lspconfig.rust_analyzer.setup({})
+            lspconfig.pyright.setup({
+                capabilities = capabilities,
+            })
+
+            lspconfig.rust_analyzer.setup({
+                capabilities = capabilities,
+            })
 
             lspconfig.lua_ls.setup({
+                capabilities = capabilities,
                 settings = {
                     Lua = {
                         runtime = {