feat: Add project description and usage instructions to README.md

README.md

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+# Milquetoast
+
+Milquetoast is a Clojure library for interacting with MQTT brokers. It provides a simple and intuitive API for sending and receiving messages, subscribing to topics, and managing MQTT connections.
+
+## Usage
+
+First, connect to the MQTT broker:
+
+```clojure
+(def client (milquetoast.api/connect! :host "localhost" :port 1883))
+```
+
+To send a message:
+
+```clojure
+(milquetoast.api/send! client "test/topic" "Hello, MQTT!")
+```
+
+To subscribe to a topic and receive messages:
+
+```clojure
+(def chan (milquetoast.api/subscribe! client "test/topic"))
+```
+
+You can then take messages from the channel as they arrive.
+
+To disconnect from the broker:
+
+```clojure
+(milquetoast.api/stop! client)
+```
+
+For more detailed usage, see the API documentation and the example code in the `examples` directory.