feat: enhance Neovim configuration with NetRW disabling, auto number toggling, and code folding setup

notes.md

@@ -0,0 +1,26 @@
+## Code folding
+
+To see the code fold in left gutter.
+set foldcolumn=1
+
+### Creating fold
+#### Set coding folding mode
+:set foldmethod=manual
+
+#### Creating a manual fold
+1. First select a section of lines in visual mode.
+2. Press `zf` to create fold, it is `zd` to delete the same fold.
+3. `zo` to open fold, `zc` to close fold, `za` to toggle open/close fold
+
+
+#### Creating indent fold
+:set foldmethod=indent
+
+
+#### Creating expr fold using nvim-treesitter
+:set foldlevel=2
+:set foldmethod=expr
+:set foldexpr=nvim_treesitter#foldexpr()
+
+
+vim.wo.foldmethod = 'expr'