update readme.md #1

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@ -127,6 +127,8 @@ Connection scheme for a typical dual-zone heating system with two heaters and tw
| 7 | Grelec 2 | Heater 2 Neutral / Return | |
| 8/PE | Termočlen 2- | Thermocouple 2 Negative | White / Red |
![Wiring picture](static/pictures/7_pe.png)
**Notes:**
- Pins 1 & 5 → Heater 1 (usually 230 V AC or 24 V, depending on system)