Add promises to readme (#71)

* added handling promises to readme
revelrylabs · Sep 15, 2021 · b5c9604 · b5c9604
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commit b5c9604
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diff --git a/README.md b/README.md
@@ -96,3 +96,19 @@ NodeJS.call("echo", ["’"], binary: true) # => {:ok, "’"}
   ```bash
   mix test
   ```
+
+### Handling Callbacks and Promises  
+
+You can see examples of using promises in the tests here:
+
+https://github.com/revelrylabs/elixir-nodejs/blob/master/test/nodejs_test.exs#L125
+
+and from the JavaScript code here:
+
+```
+module.exports = async function echo(x, delay = 1000) {
+  return new Promise((resolve) => setTimeout(() => resolve(x), delay))
+}
+```
+
+https://github.com/revelrylabs/elixir-nodejs/blob/master/test/js/slow-async-echo.js