added hardware for lilygo_t-relay-4

lilygo_t-relay-4.yaml

+esp32:
+  board: esp32dev
+  framework:
+    type: esp-idf
+
+switch:
+  - platform: gpio
+    pin: GPIO21
+    id: relay1
+
+  - platform: gpio
+    pin: GPIO19
+    id: relay2
+
+  - platform: gpio
+    pin: GPIO18
+    id: relay3
+
+  - platform: gpio
+    pin: GPIO5
+    id: relay4
\ No newline at end of file