Добавлены библиотеки для работы с MQTT

libraries/async-mqtt-client/docs/1.-Getting-started.md

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+# Getting started
+
+To use AsyncMqttClient, you need:
+
+* An ESP8266
+* The Arduino IDE for ESP8266 (version 2.2.0 minimum)
+* Basic knowledge of the Arduino environment (upload a sketch, import libraries, ...)
+
+## Installing AsyncMqttClient
+
+There are two ways to install AsyncMqttClient.
+
+### 1a. For the Arduino IDE
+
+1. Download the [corresponding release](https://github.com/marvinroger/async-mqtt-client/releases/latest)
+2. Load the `.zip` with **Sketch → Include Library → Add .ZIP Library**
+
+AsyncMqttClient has 1 dependency: [ESPAsyncTCP](https://github.com/me-no-dev/ESPAsyncTCP). Download the [.zip](https://github.com/me-no-dev/ESPAsyncTCP/archive/master.zip) and install it with the same method as above.
+
+## Fully-featured sketch
+
+See [examples/FullyFeatured-ESP8266.ino](../examples/FullyFeatured-ESP8266/FullyFeatured-ESP8266.ino)
+
+**<u>Very important:</u> As a rule of thumb, never use blocking functions in the callbacks (don't use `delay()` or `yield()`).** Otherwise, you may very probably experience unexpected behaviors.
+
+You can go to the [API reference](2.-API-reference.md).