Add schemas for Darwin Reference data

schemas/data-ingress/darwin-reference-data/darwin-via-text.json

@@ -0,0 +1,67 @@
+{
+    "$id": "https://schema.owlboard.info/data-ingress/darwin/ref/via-text.schema.json",
+    "$schema": "https://json-schema.org/draft-07/schema#",
+    "title": "DarwinViaText",
+    "type": "object",
+    "properties": {
+        "service_name": {
+            "type": "string",
+            "description": "Name of the service submitting the update"
+        },
+        "service_id": {
+            "type": "string",
+            "description": "ID of the service sending the message - usually a hostname"
+        },
+        "data_type": {
+            "type": "string",
+            "const": "raw",
+            "description": "The type of data contained in this message object"
+        },
+        "sent_timestamp": {
+            "type": "integer",
+            "description": "Unix timestamp representing the time the message was sent"
+        },
+        "data_kind": {
+            "type": "string",
+            "const": "ref-darwin-via-text",
+            "description": "The data type contained in the message.  Currently supported PIS: PIS Data, Timetable: CIF or VSTP Data, Knowledgebase: Station Data"
+        },
+        "payload": {
+            "type": "array",
+            "additionalItems": false,
+            "items": {
+                "type": "object",
+                "required": ["a", "d", "l1", "v"],
+                "properties": {
+                    "a": {
+                        "name": "at",
+                        "type": "string",
+                        "description": "The CRS defining where the text should be displayed"
+                    },
+                    "d": {
+                        "name": "destination",
+                        "type": "string",
+                        "description": "The text should apply to trains to this destination"
+                    },
+                    "l1": {
+                        "name": "location-one",
+                        "type": "string",
+                        "description": "Message triggered if loc1 & loc2 (if present) are listed as stops"
+                    },
+                    "l2": {
+                        "name": "location-two",
+                        "type": "string",
+                        "description": "Message triggered if loc1 & loc2 (if present) are listed as stops"
+                    },
+                    "v": {
+                        "name": "viaText",
+                        "description": "The text that should be displayed",
+                        "type": "string"
+                    }
+                }
+            }
+        }
+    },
+    "required": ["service_name", "service_id", "data_type", "data_kind", "sent_timestamp"],
+    "additionalProperties": false
+}