add firmware for esp12

platformio.ini

@@ -26,3 +26,9 @@ board = nodemcuv2
 platform = espressif8266
 framework = arduino
 board = d1_mini
+
+[env:esp12]
+platform = espressif8266
+board = esp12e
+framework = arduino
+build_flags = -Wl,-Tesp8266.flash.4m1m.ld