neovim: Add LSP settings

 This is based on:
 https://namileriblog.com/mac/lazy_nvim_lsp/

 refs #206

neovim/lua/plugins/lsp.lua

@@ -0,0 +1,29 @@
+local lsp_servers = {
+    "bashls",
+    "lua_ls",
+}
+
+return {
+    {
+        "williamboman/mason.nvim",
+        dependencies = {
+            "williamboman/mason-lspconfig.nvim",
+            "neovim/nvim-lspconfig",
+        },
+        config = function()
+            require("mason").setup()
+            require("mason-lspconfig").setup({
+                ensure_installed = lsp_servers,
+            })
+            local lsp_config = require("lspconfig")
+            for _, lsp_server in ipairs(lsp_servers) do
+                lsp_config[lsp_server].setup({
+                    root_dir = function(fname)
+                        return lsp_config.util.find_git_ancestor(fname) or vim.fn.getcwd()
+                    end,
+                })
+            end
+        end,
+    },
+}
+