docs(graphql): sorting documentation (#115)

docs/guide/graphql/sorting/index.md

@@ -6,6 +6,60 @@ title: Sorting
 
 ---
 
-// TODO
+Most queries provide a unique `sort` argument to manage resource sorting.
+This argument accepts a list of `{type}SortableColumns` enum cases.
 
-// Note: Waiting API refactor.
+To sort in ascending order, the field name is enough.
+
+To sort in descending order, append `_DESC` to the field name.
+
+## Query
+
+```graphql
+{
+    animes(sort: NAME) { # Sorting in ascending direction.
+        data {
+            name
+        }
+    }
+
+    animes(sort: NAME_DESC) { # Sorting in descending direction.
+        data {
+            name
+        }
+    }
+}
+```
+
+## Nested Sorting
+
+It is possible to sort the relationships of the parent type.
+
+```graphql
+{
+    animes {
+        data {
+            resources(sort: EXTERNAL_ID) {
+                nodes {
+                    externalId
+                }
+            }
+        }
+    }
+}
+```
+
+## Multiple Sorting
+
+By providing a list of enum cases, the sort will be applied in the order of the values provided by the client.
+
+```graphql
+{
+    animes(sort: [YEAR_DESC, SEASON]) {
+        data {
+            year
+            season
+        }
+    }
+}
+```