added custom configuration

lua/custom/plugins/nvimtree.lua

@@ -0,0 +1,44 @@
+return {
+  'nvim-tree/nvim-tree.lua',
+  version = '*',
+  lazy = false,
+  dependencies = {
+    'nvim-tree/nvim-web-devicons',
+  },
+  config = function()
+    local HEIGHT_RATIO = 0.8
+    local WIDTH_RATIO = 0.5
+    require('nvim-tree').setup {
+      view = {
+        float = {
+          enable = true,
+          open_win_config = function()
+            local screen_w = vim.opt.columns:get()
+            local screen_h = vim.opt.lines:get() - vim.opt.cmdheight:get()
+            local window_w = screen_w * WIDTH_RATIO
+            local window_h = screen_h * HEIGHT_RATIO
+            local window_w_int = math.floor(window_w)
+            local window_h_int = math.floor(window_h)
+            local center_x = (screen_w - window_w) / 2
+            local center_y = ((vim.opt.lines:get() - window_h) / 2) - vim.opt.cmdheight:get()
+            return {
+              border = 'rounded',
+              relative = 'editor',
+              row = center_y,
+              col = center_x,
+              width = window_w_int,
+              height = window_h_int,
+            }
+          end,
+        },
+        width = function()
+          return math.floor(vim.opt.columns:get() * WIDTH_RATIO)
+        end,
+      },
+    }
+  end,
+  opts = function()
+    local mappings = { { '<leader>e', '<cmd>NvimTreeOpen<CR>', desc = 'File [E]xplorer' } }
+    require('which-key').add(mappings)
+  end,
+}