add readme

README.md

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+# Usage
+
+Load with `Lazy.nvim`
+
+```lua
+{
+  -- Neorg is still required because we need its code to complete the setup of
+  -- highlight groups.
+  "nvim-neorg/neorg",
+  version = "^9.0.0",
+  lazy = true,
+  config = nil,
+},
+{
+  url = "https://git.gensokyo.cafe/kkyy/neorg-migrate-tmp.git",
+  ft = "norg",
+  dependencies = {
+    "nvim-neorg/neorg",
+  },
+  config = function()
+    local norg_hl = require("neorg.modules.core.highlights.module")
+    norg_hl.public.trigger_highlights()
+  end,
+},
+```