Update readme

Author: chenglou

Readme.md

@@ -1,38 +1,31 @@
-
 # Rescript Editor Support
 
 This is a private command line binary used by [rescript-vscode](https://github.com/rescript-lang/rescript-vscode) to power a few functionalities such as jump to definition, hover and autocomplete.
 
 The binary reads the `.cmt` and `.cmti` files and analyses them.
 
-## Status
+## Install
 
-This is a preliminary version for early testing, the CLI is not stable yet.
+```
+opam switch 4.06.1
+opam opam install . --deps-only
+```
 
 ## Build
 
 ```
 dune build
 ```
 
-## Usage
-
-### dump
-
-Compute jump-to-definition and hover information for `Foo.res` at line `0` and column `4`:
+The built artifact is in `_build/install/default/bin/rescript-editor-support.exe`
 
-```
-rescript-editor-support.exe dump src/Foo.res:0:4
-```
-
-### complete
+## Usage
 
-Compute autocomplete for `Foo.res` at line `0` and column `4`, where `Foo.res` is being edited and its current content in the editor is in file `Current.res`.
+Run:
 
+```sh
+_build/install/default/bin/rescript-editor-support.exe --help
 ```
-rescript-editor-support.exe complete src/Foo.res:0:4 Current.res
-```
-
 
 ## History