108536490: Initial effort to implement log in

Add endpoint for post to /sign-in
Initialise role data

app/main/forms.py

@@ -0,0 +1,14 @@
+from flask_wtf import Form
+from wtforms import StringField, PasswordField
+from wtforms.validators import DataRequired, Email, Length
+
+
+class LoginForm(Form):
+    email_address = StringField('Email address', validators=[
+        Length(255),
+        DataRequired(message='Email cannot be empty'),
+        Email(message='Please enter a valid email address')
+    ])
+    password = PasswordField('Password', validators=[
+        DataRequired(message='Please enter your password')
+    ])