Add README

README.md

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+nil: Language server of Nix Expression Language
+
+## Installation
+
+1. Have the latest stable version of Rust installed.
+2. `cargo install --git https://github.com/oxalica/nil.git`
+
+### For neovim `nvim-lspconfig` user
+
+Add the following vimscript to your configuration.
+
+```vim
+lua <<EOF
+  require('lspconfig').rnix.setup {
+    autostart = true,
+    -- Set to the path to `nil` binary you installed.
+    cmd = { vim.env.HOME .. "/.local/bin/nil" },
+  }
+EOF
+```
+
+## License
+
+"nil" is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0).
+
+See LICENSE-APACHE and LICENSE-MIT for details.