docs: add OpenAPI documentation

openapi/examples/HummusV1In.yaml

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+summary: Hummus recipe
+value:
+  {
+    "name": "Hummus",
+    "description": "Hummus, is a Levantine dip, spread, or savory dish made from cooked, mashed chickpeas blended with tahini, lemon juice, and garlic.",
+    "categories": [ "Dip", "Spread" ],
+    "ingredients":
+      [ "Chickpeas", "Tahini", "Olive oil", "Lemon juice", "Garlic" ],
+    "steps":
+      [
+        "Combine chickpeas, tahini, olive oil, lemon juice, garlic, and salt in a food processor.",
+        "Blend until smooth, slowly adding cold water until you reach a creamy consistency.",
+        "Taste and adjust seasoning if needed.",
+      ],
+  }