Add schema description and JSON schema files

schema/project.json

@@ -0,0 +1,22 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://www.suruatoel.xyz/codes/protime/project.json",
+    "title": "Project",
+    "description": "A project entry",
+    "type": "object",
+    "properties": {
+        "id": {
+            "description": "",
+            "type": "string",
+            "format": "uuid"
+        },
+        "title": {
+            "description": "",
+            "type": "string"
+        }
+    },
+    "required": [
+        "id",
+        "title"
+    ]
+}