update Readme

Author: bitbegin

README.md

@@ -1 +1,12 @@
-# redlangserver
+# redlangserver
+
+A `Red language` server written in `Red` for [lsp](https://langserver.org/). 
+
+It's a submodule for [red/VScode-extension](https://github.com/red/VScode-extension).
+
+## Features
+
+* hint all syntax errors
+* auto completion
+* goto definition
+* hover to view signatures