add session management section

vimrc

@@ -77,6 +77,12 @@ set smartcase
 set nobackup
 set noswapfile
 
+
+" session management
+let g:session_directory = "~/.vim/session"
+let g:session_autoload = "no"
+let g:session_autosave = "no"
+let g:session_command_aliases = 1
 "" Mouse
 set mouse=a
 
@@ -230,6 +236,12 @@ vnoremap <silent> <Leader>0 :!node<cr>
 nnoremap + <c-a>
 nnoremap - <c-x>
 
+" session management
+nnoremap <leader>so :OpenSession<Space>
+nnoremap <leader>ss :SaveSession<Space>
+nnoremap <leader>sd :DeleteSession<CR>
+nnoremap <leader>sc :CloseSession<CR>
+
 "
 " Plugin Configuration
 "