Add Sign Up User With Email And Password as Amplify til

amplify/sign-up-user-with-email-and-password.md

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+# Sign Up User With Email And Password
+
+[AWS Amplify](https://aws.amazon.com/amplify/)
+[Auth](https://docs.amplify.aws/lib/auth/getting-started/q/platform/js) offers
+both federated and username/password based authentication. Though the docs
+aren't clear, the required `username` parameter can be used as the email field
+with the [`signUp`
+API](https://aws-amplify.github.io/amplify-js/api/classes/authclass.html#signup).
+
+```javascript
+import { Auth } from 'aws-amplify';
+
+async function signUp({ email, password }) {
+  try {
+    const user = await Auth.signUp({
+      username: email,
+      password,
+      attributes: {},
+    });
+    console.log({ user });
+  } catch (error) {
+    console.log('error signing up:', error);
+  }
+}
+```
+
+Once the user has entered an email and password into the Sign Up form, those
+values can be passed to this `signUp` function. The `email` value is passed as
+the `username` and the `password` goes in as is.
+
+Amplify Auth will interpret the `username` as an email and register it as the
+contact email for this user.