108536366: Implement register flow

Includes validation for gov.uk email address, mobile number with +44, password at least 10 char.
Form validation errors will be added to template in a later story.
User is created when form validates.

app/main/views/register.py

@@ -0,0 +1,33 @@
+from datetime import datetime
+
+from flask import render_template, redirect, jsonify
+
+from app.main import main
+from app.main.dao import users_dao
+from app.main.forms import RegisterUserForm
+from app.models import User
+
+
+@main.route("/register", methods=['GET'])
+def render_register():
+    return render_template('register.html', form=RegisterUserForm())
+
+
+@main.route('/register', methods=['POST'])
+def process_register():
+    form = RegisterUserForm()
+
+    if form.validate_on_submit():
+        user = User(name=form.name.data,
+                    email_address=form.email_address.data,
+                    mobile_number=form.mobile_number.data,
+                    password=form.password.data,
+                    created_at=datetime.now(),
+                    role_id=1)
+        try:
+            users_dao.insert_user(user)
+            return redirect('/two-factor')
+        except Exception as e:
+            return jsonify(database_error=e.message), 400
+    else:
+        return jsonify(form.errors), 400