Add stub article about Spree::Reimbursements

guides/returns/reimbursements.md

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+# Reimbursements
+
+<!-- TODO:
+  This article is a stub.
+-->
+
+A `Spree::Reimbursement` represents your store's compensation to the customer
+who is returning items. For example, if a customer is not happy with the quality
+of your product and they decide to return it, your store may want to offer them
+store credit for the price of the item.
+
+A `Spree::Reimbursement` can represent the reimbursement of one or many
+`Spree::ReturnItem`s. However, if the return items have different
+`Spree::ReimbursementType`s assigned, then multiple reimbursements are created
+for a single customer return.
+
+Each `Spree:Reimbursement` object has the following attributes:
+
+- `number`: A unique eleven-character number that identifies the reimbursement.
+  The number starts with `RI`. For example: `RI123456789`.
+- `reimbursement_status`: The status of the current reimbursement.
+- `customer_return_id`: The ID for the `Spree::CustomerReturn` that is
+  associated with this reimbursement.
+- `order_id`: The ID for the `Spree::Order` that is associated with the items on
+  the reimbursement.
+- `total`: The total value of the reimbursement. Depending on the
+  `Spree::ReimbursementType`, this value may be `nil`.
+