Add README.md for FFmpeg capture driver

webcam-capture-drivers/webcam-capture-driver-ffmpeg-cli/README.md

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+# FFmpeg CLI Capture Driver
+
+This is a proof-of-concept, experimental capture driver. It uses FFmpeg to 
+stream MJPEG-encoded video from webcam device into named pipe. 
+This pipe is later read by Java process and converts stream to the 
+```BufferedImage``` object returned from ```Webcam.getImage()``` 
+method. 
+
+This driver works only on Linux, you have to have
+[ffmpeg](http://linuxers.org/tutorial/how-install-ffmpeg-linux)
+instaled on your PC, it's buggy and not well designed (has 
+terrible memory consumption), and will probably remain as such 
+untill somebody redesign it. Therefore, if you found a bug in this driver
+code, or you would like to perform any enhancement, feel free to 
+send pull request. Due to other urgent issues, I wont put any effort
+to enhance and/or fix this driver.
+
+## How To Use It
+
+Set new driver before you start using Webcam class:
+
+```java
+Webcam.setDriver(new FFmpegCliDriver());
+Webcam webcam = Webcam.getDefault();
+webcam.open();
+// ... do your stuff
+webcam.close();
+```
+
+## License
+
+This particular driver code is released under Public Domain license.
+
+---
+
+I, the copyright holder of this work, hereby release it into the
+public domain. This applies worldwide.
+
+In case this is not legally possible, I grant any entity the right
+to use this work for any purpose, without any conditions, unless 
+such conditions are required by law.
+