Added new JSON field documentation (#153)

Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: #153

Swagger/swagger.json

@@ -540,7 +540,7 @@
             "schema": {
               "type": "array",
               "items": {
-                "$ref": "#/definitions/Response"
+                "$ref": "#/definitions/XPathResponse"
               }
             }
           },
@@ -1006,6 +1006,39 @@
         }
       }
     },
+    "XPathResponse": {
+      "type": "object",
+      "properties": {
+        "result": {
+          "type": "string",
+          "example": "4",
+          "description": "Result of performing transformation on provided XML"
+        },
+        "time": {
+          "type": "string",
+          "example": "320",
+          "description": "Computation time in milliseconds"
+        },
+        "processor": {
+          "type": "string",
+          "enum": [
+            "Saxon 10.3 2.0 over s9api",
+            "Xalan Java 2.7.2",
+            "libXml over lxml"
+          ]
+        },
+        "status": {
+          "type": "string",
+          "enum": [
+            "OK"
+          ]
+        },
+        "type": {
+          "type": "string",
+          "description": "Optional. Specifies type of data returned by Xalan or libXML."
+        }
+      }
+    },
     "ResponseError": {
       "type": "object",
       "properties": {