Reference for checkoutAgreement GraphQl query

Fixes magento/graphql-ce#767

guides/v2.3/graphql/reference/checkout-aggreements.md

@@ -0,0 +1,71 @@
+---
+group: graphql
+title: Directory endpoint
+contributor_name: Something Digital
+contributor_link: https://www.somethingdigital.com/
+---
+
+To retrieve enabled checkout agreements. The query will always return an empty array when
+`checkout/options/enable_agreements` is disabled.
+
+### CheckoutAgreement attributes {#countryAttributes}
+
+The `CheckoutAgreement` object provides the following attributes:
+
+Attribute | Data type | Description
+--- | --- | ---
+`agreement_id` | Integer | Checkout Agreement identifier
+`name` | String | Checkout Agreement name
+`content` | String | Checkout Agreement plaintext or HTML content
+`content_height` | String | CSS height of Checkout Agreement
+`checkbox_text` | String | Checkout Agreement checkbox label
+`is_html` | Boolean | Is Checkout Agreement content in HTML format
+`mode` | [CheckoutAgreementMode](#checkoutAgreementMode) | An array of regions within a particular country
+
+### CheckoutAgreementMode enumerable {#checkoutAgreementMode}
+- AUTO
+- MANUAL
+
+#### Syntax
+
+`{checkoutAgreements {CheckoutAgreement}}`
+
+### Example usage
+
+The following query returns enabled checkout agreements.
+
+**Request** 
+
+```text
+{
+  checkoutAgreements {
+    agreement_id
+    checkbox_text
+    content
+    content_height
+    is_html
+    mode
+    name
+  }
+}
+```
+
+**Response**
+
+```json
+{
+  "data": {
+    "checkoutAgreements": [
+      {
+        "agreement_id": 1,
+        "checkbox_text": "I agree to the terms of sale",
+        "content": "<p><strong>Agreement Contents</strong></p>\r\n<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>",
+        "content_height": "22px",
+        "is_html": true,
+        "mode": "AUTO",
+        "name": "My Agreement"
+      }
+    ]
+  }
+}
+```