Add default keymaps for netrw navigation

Includes keybindings for navigation, file operations, and batch
operations to enhance user experience with netrw.

README.md

@@ -52,11 +52,57 @@ Core keymaps available globally (not plugin-specific). These provide fallbacks f
 
 ### `lua/netrw-config.lua`
 
+#### Custom Keymaps
+
 | Mode | Key | Description |
 | --- | --- | --- |
 | n | `<leader>te` | Open netrw in a new tab rooted at current file directory |
 | n | `<leader>tE` | Open netrw in a new tab rooted at project cwd |
 
+#### Default Netrw Keymaps
+
+##### Navigation & View
+
+| Key | Description |
+| --- | --- |
+| `<CR>` | Open file/directory under cursor |
+| `-` | Go up to parent directory |
+| `gh` | Toggle hidden files visibility (dotfiles) |
+| `i` | Cycle through view types (thin/long/wide/tree) |
+| `s` | Cycle sort order (name/time/size/extension) |
+| `r` | Reverse current sort order |
+| `I` | Toggle netrw banner (help text) |
+
+##### Preview & Splits
+
+| Key | Description |
+| --- | --- |
+| `p` | Preview file in horizontal split (50% window size) |
+| `P` | Open file in previous window |
+| `o` | Open file in horizontal split below |
+| `v` | Open file in vertical split |
+
+##### File Operations
+
+| Key | Description |
+| --- | --- |
+| `%` | Create new file (prompts for name) |
+| `d` | Create new directory (prompts for name) |
+| `D` | Delete file/directory under cursor |
+| `R` | Rename/move file under cursor |
+
+##### Marking & Batch Operations
+
+| Key | Description |
+| --- | --- |
+| `mf` | Mark file (for batch operations) |
+| `mr` | Mark files using regex pattern |
+| `mu` | Unmark all marked files |
+| `mt` | Set mark target directory (for move/copy destination) |
+| `mc` | Copy marked files to target directory |
+| `mm` | Move marked files to target directory |
+| `qf` | Display file info |
+
 ## Plugin Reference
 
 ### LSP `lua/plugins/lsp.lua`