Add embedded web chat client (closes #7) (#8)

schema/commands/NOTICE.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/NOTICE.json",
+  "title": "NOTICE",
+  "description": "Send a notice. Like PRIVMSG but must not trigger automatic replies. RFC 1459 §4.4.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "NOTICE" },
+    "from": { "type": "string" },
+    "to": { "type": "string", "description": "Target: #channel, nick, or * (global)." },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Notice text lines."
+    }
+  },
+  "required": ["command", "to", "body"],
+  "examples": [
+    { "command": "NOTICE", "from": "server.example.com", "to": "*", "body": ["Server restarting in 5 minutes"] }
+  ]
+}