Add a new page to our site, signup.erb
```
<form action="/signup" method="post">
	<label for="email">Email:</label>
	<input type="text" name="email" id="email">

	<label for="password">Password</label>
	<input type="password" name="password" id="password">

	<input type="submit">
</form>
```

Recieving Data

```
# get signup (handles when users browse to signup page)
get '/signup' do
	@user = User.new
	erb :signup
end

# post stuff (handles when users try and signup to our site)
post '/signup' do
	email = params[:email]
	password = params[:password]
	@user = User.new({ email: email, password: password })

	# runs our validation and returns a boolean
	if	@user.save()
		redirect '/'
	else
		erb :signup
	end
end
```

Validation helps make sure bad data isn't being put into our database
```
class User < ActiveRecord::Base
	validates :username, :email, presence: true
	validates :email, uniqueness: true
end
```