docs: elm usage

README.md

@@ -1,2 +1,52 @@
 # write-elm
+
 use fp framework
+
+## install guide
+
+[link](https://guide.elm-lang.org/install/elm.html)
+
+## elm init
+
+You can start an Elm project by running:
+
+```shell
+$ elm init
+```
+
+## elm reactor
+
+```shell
+$ elm reactor
+```
+
+## elm make
+
+```shell
+# Create an index.html file that you can open in your browser.
+elm make src/Main.elm
+
+# Create an optimized JS file to embed in a custom HTML document.
+elm make src/Main.elm --optimize --output=elm.js
+```
+
+## elm install
+
+```shell
+$ elm install elm/http
+$ elm install elm/json
+```
+
+## elm format
+
+```shell
+$ npm install elm-format -g
+```
+
+**from a Source Editor**
+
+[ vscode plugins elm-format ](https://marketplace.visualstudio.com/items?itemName=abadi199.elm-format#:~:text=VSCode%20Elm%20Format,you%20can%20use%20this%20extension.)
+
+## Tips
+
+run `elm --help`