add esp07 firmware

platformio.ini

@@ -31,4 +31,10 @@ board = d1_mini
 platform = espressif8266
 board = esp12e
 framework = arduino
-build_flags = -Wl,-Tesp8266.flash.4m1m.ld
+build_flags = -Wl,-Tesp8266.flash.4m1m.ld
+
+[env:esp07]
+platform = espressif8266
+board = esp07
+framework = arduino
+build_flags = -Wl,-Tesp8266.flash.1m64.ld