Added Smart (Mercedes brand Car) to the list

This adds information about Smart not being accessible via API depending on the vendor's grace.

Ref: ReneNulschDE/mbapi2020#287
Ref: ReneNulschDE/mbapi2020#303
Ref: ReneNulschDE/mbapi2020@7e45460
Ref: https://community.home-assistant.io/t/mercedes-me-component/41911/2310

Author: Ocramius

README.md

@@ -61,6 +61,7 @@ to find when the list gets larger
 | Ooma VOIP | No API, no integration. | 2024-11-15 | None |
 | Philips Hue | Philips is forcing users to "upgrade" to a version of their Philips app that requires login to a cloud account. See [How-To Geek](https://www.howtogeek.com/philips-hue-will-soon-require-online-accounts-to-control-lights/) | 2023-11-07 | Use a generic Zigbee coordinator instead of the Philips one |
 | RecTeq Smokers | Tuya based, but per [reddit](https://www.reddit.com/r/homeassistant/comments/1graane/comment/lx56e3x), they pushed an update that locked people out of their smokers. | 2024-11-15 | None |
+| Smart (Car) | Mercedes, the company owning Smart, arbitrarily disables access to their API for third parties. See [ReneNulschDE/mbapi2020/287](https://github.com/ReneNulschDE/mbapi2020/issues/287) | 2025-10-06 | Coonnect to your car via OBD (WiCan/MeatPI or similar) |
 | Shark Vacuums | Shark has altered the API and broken the SharkIQ integration. See [sharkiq/issues/51](https://github.com/JeffResc/sharkiq/issues/51). This is an vendor problem, please don't harass the sharkiq maintainer. | 2024-11-14 | None |
 | Tesla (Powerwall) | Tesla have updated their gateway firmware to progressively hobble it, reducing the ability for owners to monitor their devices.  This has reached peak enshittification with firmware version 24.36.2 and later with Gateway 1 vintage gateways.  Although you can temporarily gain access by going through the _I forgot my password_ routine via the Tesla Energy Gateway (TEG) WiFi access point, and log in to the integration in Home Assistant immediately with the new password, **the gateway itself forgets the new password** within an hour, and once the login cookie expires, any logged in device loses access.  | 2024-02-02 | Tesla Fleet provides a dramatically reduced subset of information |
 | Tesla | Tesla is now [Charging for API access](https://developer.tesla.com/docs/fleet-api/billing-and-limits) to the vehicle API. They're adding a new Fleet API that costs money to use. The Owner API is working for now, but it's unclear when/if support for it is going to be dropped. | 2024-12-15 | None |