docs(readme): add instructions to fix broken icons of Nerd Fonts v3 (#921)

Author: loichyan

README.md

@@ -357,6 +357,47 @@ into a buffer after installing Neo-tree by running:
 :lua require("neo-tree").paste_default_config()
 ```
 
+#### Configuration for Nerd Fonts v3 Users
+
+The following configuration should fix broken icons if you are using Nerd Fonts v3:
+
+```lua
+require("neo-tree").setup({
+  default_component_configs = {
+    icon = {
+      folder_empty = "󰜌",
+      folder_empty_open = "󰜌",
+    },
+    git_status = {
+      symbols = {
+        renamed   = "󰁕",
+        unstaged  = "󰄱",
+      },
+    },
+  },
+  document_symbols = {
+    kinds = {
+      File = { icon = "󰈙", hl = "Tag" },
+      Namespace = { icon = "󰌗", hl = "Include" },
+      Package = { icon = "󰏖", hl = "Label" },
+      Class = { icon = "󰌗", hl = "Include" },
+      Property = { icon = "󰆧", hl = "@property" },
+      Enum = { icon = "󰒻", hl = "@number" },
+      Function = { icon = "󰊕", hl = "Function" },
+      String = { icon = "󰀬", hl = "String" },
+      Number = { icon = "󰎠", hl = "Number" },
+      Array = { icon = "󰅪", hl = "Type" },
+      Object = { icon = "󰅩", hl = "Type" },
+      Key = { icon = "󰌋", hl = "" },
+      Struct = { icon = "󰌗", hl = "Type" },
+      Operator = { icon = "󰆕", hl = "Operator" },
+      TypeParameter = { icon = "󰊄", hl = "Type" },
+      StaticMethod = { icon = '󰠄 ', hl = 'Function' },
+    }
+  },
+  -- Other options ...
+})
+```
 
 ## The `:Neotree` Command