Added Serial.baudRate() to get current baud rate (#2079)

* Changed WifInfo settings and WeMos board name

* Added board name to have in sketch and MDNS/OTA

* board naming convention

https://github.com/esp8266/Arduino/pull/2054

* Added Serial.baudRate() to get current baud rate

* Added more description

- Added note about Software Serial Implementation
- Indicate this will works on ESP8266 boards only

cores/esp8266/HardwareSerial.cpp

@@ -180,6 +180,13 @@ size_t HardwareSerial::write(uint8_t c)
     return 1;
 }
 
+int HardwareSerial::baudRate(void)
+{
+    // Null pointer on _uart is checked by SDK
+    return uart_get_baudrate(_uart);
+}
+
+
 HardwareSerial::operator bool() const
 {
     return _uart != 0;