created Readme

README.md

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+#pyb_DMX
+This module tries to make it slightly simpler to send DMX512 messages to lights
+
+Here is a very simple example of how it works, ideally ```write_frame()``` should be done on a timer interrupt as DMX lights expect a regular message
+
+```python
+# create a dmx device on UART port 1
+dmx1 = dmx.universe(1)
+
+# Set the channel(s) to the value you want
+DMX1.set_channels({1:i})
+
+# Send the message
+DMX1.write_frame()
+```
+
+thanks to this website for useful details
+[http://www.ubasics.com/DMX-512]