Added extension for mason (#1113)

* feat: added extension for mason

* feat: update readme

* feat: capitalize the first letter

* feat: delete icon

---------

Co-authored-by: Shadman <13149513+shadmansaleh@users.noreply.github.com>

README.md

@@ -912,6 +912,7 @@ extensions = {'quickfix'}
 - symbols-outline
 - toggleterm
 - trouble
+- mason
 
 #### Custom extensions
 

lua/lualine/extensions/mason.lua

@@ -0,0 +1,25 @@
+-- lualine extension for mason.nvim
+
+local ok, mason_registry = pcall(require, 'mason-registry')
+if not ok then
+  return ''
+end
+
+local M = {}
+
+M.sections = {
+  lualine_a = {
+    function()
+      return 'Mason'
+    end,
+  },
+  lualine_b = {
+    function()
+      return 'Installed: ' .. #mason_registry.get_installed_packages() .. '/' .. #mason_registry.get_all_package_specs()
+    end,
+  },
+}
+
+M.filetypes = { 'mason' }
+
+return M