You may use any vim package manager of your choice. The below snippet uses junegunn's vim-plug package manager.

Plug 'pradyungn/Mountain', {'rtp': 'vim'}

Mountain theme also comes with its own minimal statusline, pictured in the screenshot above. It can be enabled by setting the g:enable_mountain_statusline variable to 1 in your configuration.

• WebDevIcons Vim Plugin
• A Nerd Font in the Terminal