feat: updated .vimrc, naming

shell/.vimrc

@@ -1,6 +0,0 @@
-:set mouse=r
-:color desert
-:syntax on
-:set nu
-:set list
-:set listchars=tab:>-

shell/dot.vimrc

@@ -0,0 +1,15 @@
+:set mouse=r
+:color desert
+:syntax on
+:set nu
+:set list
+:set listchars=tab:>-
+
+:filetype plugin indent on
+" show existing tab with 4 spaces width
+:set tabstop=4
+" when indenting with '>', use 4 spaces width
+:set shiftwidth=4
+" On pressing tab, insert 4 spaces
+:set expandtab
+