finished auth readme

docs/auth.md

@@ -74,11 +74,17 @@ const Signout = () => {
 
 ### Sign up with email and password
 
-To use this hook you need to pass `'emailPassword'` as the first parameter
+To use this hook you need to pass `'emailPassword'` as the first parameter and an optional callback method - useful for redirects for example.
+
+The way this hook works is that it gives you objects that have their own `onChange` and `onSubmit` handlers with other things inside of them that you simply spread on your inputs to add functionality to. Hook handles the rest.
 
 ```jsx
 const Signup = () => {
-	const [ loading, error, { email, password, signup } ] = useAuth('emailPassword');
+	const [ loading, error, {
+		email,
+		password,
+		signup
+	} ] = useAuth('emailPassword', () => console.log('did it work?'));
 	return (
 		<form {...signup}>
 			<input {...email} />
@@ -90,4 +96,71 @@ const Signup = () => {
 		</form>
 	);
 };
+```
+
+### Sign up with email, password and password confirmation
+
+Similarly to email and password hook, you have to pass `'emailPasswordConfirm'` as the first parameter and optional callback function
+
+```jsx
+const SignupConfirm = () => {
+	const [ loading, error, {
+		email,
+		password,
+		confirmation,
+		onSignup
+	} ] = useAuth('emailPasswordConfirm', () => console.log('so performant wowowo'));
+	return (
+		<form {...onSignup}>
+			<input {...email} autoFocus />
+			<input {...password} />
+			<input {...confirmation} />
+			<button disabled={loading} type='submit'>
+				Sign up
+			</button>
+			<p>{JSON.stringify(error)}</p>
+		</form>
+	);
+};
+```
+
+### Sign up with Auth Provider
+
+When signing in with provider you must provide a string of which one you want to use:
+
+- `google`
+- `facebook`
+- `twitter`
+- `apple`
+- `twitter`
+- `github`
+- `microsoft`
+- `yahoo`
+
+Then you can pass in two additional parameters. First of which is `providerOptions` about which you can learn more [here](https://firebase.google.com/docs/auth/web/google-signin).
+The second optional parameter is a callback function.
+
+```jsx
+const Google = () => {
+	// simple version that works out of the box
+	const [loading, error, {popup}] = useAuth('google')
+	// or use full version
+	const [loading, error, { popup }] = useAuth(
+		'google',
+		{
+			scopes: ['your', 'scopes'],
+			customParameters: {}
+		},
+		() => console.log('yet another callback')
+	);
+	return (
+		<>
+			{error && JSON.stringify(error)}
+			<button disabled={loading} {...popup}>
+				Sign up with Google
+			</button>
+		</>
+	);
+};
+
 ```