First implementation (#1)

Reviewed-on: #1

schemas/log-entry.schema.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/log-entry.schema.json",
+  "title": "Log entry",
+  "description": "scienting-log-entry/1: one item of a team's transparency log, [kind, id, hash]: the kind of record, its ID (or the store for a roster) and its record hash; spec/23-log.md.",
+  "type": "array",
+  "prefixItems": [
+    {
+      "enum": [
+        "receipt",
+        "revocation",
+        "roster"
+      ]
+    },
+    {
+      "$ref": "common.schema.json#/$defs/key"
+    },
+    {
+      "$ref": "common.schema.json#/$defs/hash"
+    }
+  ],
+  "minItems": 3,
+  "maxItems": 3
+}