feat: add installation and usage instructions

README.md

@@ -0,0 +1,35 @@
+# MineQTT
+
+## Installation
+
+```lua
+local net = require("internet"); local io = require("io"); f = io.open("/lib/mqtt.lua", "w"); for line in net.request("https://git.luj0ga.de/luca/mineqtt/raw/branch/main/mqtt.lua") do f:write(line) end; f:flush():close()
+```
+
+## Usage
+
+```lua
+local mqtt = require("mqtt")
+
+local client, err = mqtt.open("mqtt.example.org", 1883)
+if err ~= nil then
+    error(err)
+end
+
+local err = client:connect()
+if err ~= nil then
+    error(err)
+end
+
+local err = client:handle()
+if err ~= nil then
+    error(err)
+end
+
+print(client.is_connected)
+
+local err = client:disconnect()
+if err ~= nil then
+    error(err)
+end
+```