Add simple state machine diagram

docs/grisp_connect_client.md

@@ -0,0 +1,15 @@
+```mermaid
+stateDiagram-v2
+    [*] --> init
+    init --> waiting_ip: connect == true
+    init --> idle: connect == false
+
+    idle --> waiting_ip: connect()
+    waiting_ip --> connecting: ip == true
+    connected --> waiting_ip: disconnected()
+    connected --> connected: request()
+    connected --> connected: handle_message()
+    connecting --> connected: ws_is_connected == true
+    connecting --> waiting_ip: disconnected()
+
+```