Added more informations

README.md

@@ -1,2 +1,25 @@
 # NodeMCMQTTRCSwitch
 Lua scripts to control 433mhz rc switches via MQTT
+
+
+## How it works
+The scripts using the NodeMCU modul "rc" which is eqaul to the rcswitch libary. To turn a 433mhz rc switch on or of the right code have to been send on the right gpio pin. For me its GPIO 4 and a pulse length of 185. Each of my codes has a length of 24. Because I have an "Type B" (See [RCSwitch](https://github.com/sui77/rc-switch/wiki/HowTo_OperateLowCostOutlets)) i had to convert my House and device codes to the deciaml format. For this I copied the functions `sendTriState` and `getCodeWordB` of RCSwitch in a new C++ file and generated the codes for my devices.
+
+This is what my nodeMCU does:
+1. Connect to local WLAN
+2. Connect to MQTT Server
+3. Log informations to local console and to "switches/433mhz/log"
+3. Listen to topic "switches/433mhz/"
+4. If got a message send it as data code with "rc" 
+
+So i only have to send my device codes via MQTT to the topic "switches/433mhz"
+
+## How to get it run
+
+1. You need a NodeMCU Firmware with MQTT and "rc"
+2. Edit the WLAN settings in the config.lua
+3. Edit the MQTT broker informations in the config.lua
+4. Set the topic of your choice in the config.lua
+5. If needed change the rc settings in line 76 of run.lua
+ - The call works so: `rc.send([GPIO-Pin-number],[DeciamlCode including house- and devicecode and if it should be on or off], [Pules length], [protocol number], [repeat x times])`
+  - For more informations to this part see: https://github.com/nodemcu/nodemcu-firmware/pull/478 and [RCSwitch](https://github.com/sui77/rc-switch/wiki/HowTo_OperateLowCostOutlets)