add website_membership_signup_required: force to create user before add to cart a membership product

website_membership_signup_required/views/auth_signup_templates.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+    <template id="auth_signup_fields_firstname_lastname" name="Auth Signup fields (firstname / lastname)" inherit_id="auth_signup.fields">
+        <xpath expr="//div[hasclass('field-name')]" position="replace">
+            <div class="mb-3 field-firstname">
+                <label for="firstname">First name</label>
+                <input type="text" name="firstname" t-att-value="firstname" id="firstname"
+                    class="form-control form-control-sm" placeholder="e.g. John"
+                    required="required"
+                    t-att-readonly="'readonly' if only_passwords else None"
+                    t-att-autofocus="'autofocus' if login and not only_passwords else None"/>
+            </div>
+            <div class="mb-3 field-lastname">
+                <label for="lastname">Last name</label>
+                <input type="text" name="lastname" t-att-value="lastname" id="lastname"
+                    class="form-control form-control-sm" placeholder="e.g. Doe"
+                    required="required"
+                    t-att-readonly="'readonly' if only_passwords else None"/>
+            </div>
+        </xpath>
+    </template>
+
+</odoo>