update readme

Author: mug1wara26

README.md

@@ -2,14 +2,42 @@
 
 A LSP server for [source](https://github.com/source-academy/js-slang)
 
-# Setup
+## Use
 
-First run these commands:
+The code for the lsp is in `/server` but code for testing the lsp is provided in `/client`. If you want to use this lsp in your own VSCode extension, download the
+latest version from the [releases](https://github.com/mug1wara26/source-lsp/releases) page, and copy the set up in `client/src/extension.ts`.
+Ensure that the lines
+
+```
+const serverModule = context.asAbsolutePath(
+  path.join("dist", 'source-lsp.js')
+);
+```
+
+point to the correct path to the downloaded lsp file.
+
+If you want to test out the lsp, you can clone the repo and open up VSCode
 
 ```console
-git clone https://github.com/mug1wara26/source-lsp
-cd source-lsp
-npm i
+git clone https://github.com/mug1wara26/source-lsp && cd source-lsp
+npm i 
+code .
 ```
 
-In vscode, press ctrl + shift + b to build, then press F5 to run the plugin. You can open the scripts in test_files for testing
+Then press ctrl + shift + b and enter to build, then press f5 to run the plugin.
+
+## Features
+
+Currently, the following language features are supported:
+
+* Completion
+* Go to declaration
+* Highlight names
+* Document Symbols
+* Rename symbol
+* Hover information
+* Diagnostics
+
+## Documentation
+
+Documentation for diagnostics can be found [here](server/src/rules)