add install section for neovim to readme

README.md

@@ -9,3 +9,22 @@ References:
 
 ![screenshot](./assets/screenshot.png)
 
+
+# Install
+
+## Neovim
+
+Using `nvim-treesitter`, add to your configuration
+
+```lua
+local parser_config = require("nvim-treesitter.parsers").get_parser_configs()
+parser_config.d2 = {
+  install_info = {
+    url = 'https://github.com/pleshevskiy/tree-sitter-d2',
+    revision = 'main'
+    files = { 'src/parser.c', 'src/scanner.cc' },
+  },
+  filetype = 'd2',
+};
+```
+