Add list of all manual attributes

docs/manual_span_attributes.md

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+# List of manual span attributes
+
+This document contains the list of manual Span Attributes used throughout the demo-webstore:
+
+## AdService
+
+* `app.ads.category`
+* `app.ads.contextKeys`
+* `app.ads.contextKeys.count`
+* `app.ads.count`
+
+## CartService
+
+* None yet
+
+## CheckoutService
+
+* `app.cart.items.count`
+* `app.order.id`
+* `app.order.shipping.cost`
+* `app.order.total.cost`
+* `app.order.tracking.id`
+* `app.order.items.count`
+* `app.user.currency`
+* `app.user.id`
+
+## CurrencyService
+
+* None yet
+
+## EmailService
+
+* `app.email.sent`
+* `app.order.id`
+* `app.shipping.cost.currency`
+* `app.shipping.cost.total`
+* `app.shipping.tracking.id`
+
+## FeatureFlagService
+
+* None yet
+
+## Frontend
+
+* `app.cart.size`
+* `app.cart.items.count`
+* `app.cart.shipping.cost`
+* `app.cart.total.price`
+* `app.currency`
+* `app.currency.new`
+* `app.order.total`
+* `app.product.id`
+* `app.product.quantity`
+* `app.products.count`
+* `app.request.id`
+* `app.session.id`
+* `app.user.id`
+
+## LoadGenerator
+
+* None yet
+
+## PaymentService
+
+* `app.payment.cost`
+* `app.payment.currency`
+
+## ProductCatalogService
+
+* `app.product.id`
+* `app.product.name`
+* `app.products.count`
+
+## RecommendationService
+
+* `app.products_recommended.count`
+* `app.products.count`
+* `app.filtered_products.count`
+
+## ShippingService
+
+* None yet