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docs: convert to .rst and add readthedocs

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UDP Class
---------
Methods documented for `WiFiUDP Class <https://www.arduino.cc/en/Reference/WiFiUDPConstructor>`__ in `Arduino <https://github.com/arduino/Arduino>`__
1. `begin() <https://www.arduino.cc/en/Reference/WiFiUDPBegin>`__
2. `available() <https://www.arduino.cc/en/Reference/WiFiUDPAvailable>`__
3. `beginPacket() <https://www.arduino.cc/en/Reference/WiFiUDPBeginPacket>`__
4. `endPacket() <https://www.arduino.cc/en/Reference/WiFiUDPEndPacket>`__
5. `write() <https://www.arduino.cc/en/Reference/WiFiUDPWrite>`__
6. `parsePacket() <https://www.arduino.cc/en/Reference/WiFiUDPParsePacket>`__
7. `peek() <https://www.arduino.cc/en/Reference/WiFiUDPPeek>`__
8. `read() <https://www.arduino.cc/en/Reference/WiFiUDPRead>`__
9. `flush() <https://www.arduino.cc/en/Reference/WiFiUDPFlush>`__
10. `stop() <https://www.arduino.cc/en/Reference/WiFIUDPStop>`__
11. `remoteIP() <https://www.arduino.cc/en/Reference/WiFiUDPRemoteIP>`__
12. `remotePort() <https://www.arduino.cc/en/Reference/WiFiUDPRemotePort>`__
Methods and properties described further down are specific to ESP8266.
They are not covered in `Arduino WiFi library <https://www.arduino.cc/en/Reference/WiFi>`__ documentation. Before they are fully documented please refer to information below.
Multicast UDP
~~~~~~~~~~~~~
.. code:: cpp
uint8_t beginMulticast (IPAddress interfaceAddr, IPAddress multicast, uint16_t port)
virtual int beginPacketMulticast (IPAddress multicastAddress, uint16_t port, IPAddress interfaceAddress, int ttl=1)
IPAddress destinationIP ()
uint16_t localPort ()
The ``WiFiUDP`` class supports sending and receiving multicast packets on STA interface. When sending a multicast packet, replace ``udp.beginPacket(addr, port)`` with ``udp.beginPacketMulticast(addr, port, WiFi.localIP())``. When listening to multicast packets, replace ``udp.begin(port)`` with ``udp.beginMulticast(WiFi.localIP(), multicast_ip_addr, port)``. You can use ``udp.destinationIP()`` to tell whether the packet received was sent to the multicast or unicast address.
For code samples please refer to separate section with :doc:`examples <udp-examples>` dedicated specifically to the UDP Class.