Created Plugin configurations (markdown)

Plugin-configurations.md

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+## bufferline.nvim
+
+```lua
+{
+  'akinsho/bufferline.nvim',
+  event = 'ColorScheme',
+  config = function()
+    local highlights = require('rose-pine.plugins.bufferline')
+    require('bufferline').setup({ highlights = highlights })
+  end
+}
+
+## lualine.nvim
+
+```lua
+{
+  'nvim-lualine/lualine.nvim',
+  event = 'ColorScheme',
+  config = function()
+    require('lualine').setup({
+      options = {
+        --- @usage 'rose-pine' | 'rose-pine-alt'
+        theme = 'rose-pine'
+      }
+    })
+  end
+}
+```
+
+## toggleterm.nvim
+
+```lua
+{
+  'akinsho/toggleterm.nvim',
+  event = 'ColorScheme',
+  config = function()
+    local highlights = require('rose-pine.plugins.toggleterm')
+    require('toggleterm').setup({ highlights = highlights })
+  end
+}
+```