Copy help from odt file to README.md for GitHub (and remove README)

Took the content of the .odt file and reformatted it as a markdown README for GitHub. Squashed from earlier pull request.
Merge pull request #54 from towolf/master

Copy odt contents into README (2nd pull request)
tvservice: indicate preferred mode
tvservice: allow HDMI/DVI mode to be specified
RaspiCam:

Restructured the component creation to return status codes

Added a missing function header commment
RaspiCam: Added timelapse mode to RaspiStillYUV
Fixed up EXIF setting as sending data whilst encoder port was active
is not allowed. Now close port between captures to allow setting.
hello_audio: better support for multichannel
Merge pull request #55 from JamesH65/camera_dev

Component creation functions changed to return status
hello_audio: support different sample rates
Fixed up so RAW works for each capture in timelapse mode
Merge pull request #57 from JamesH65/camera_dev

Fixed up so RAW works for each capture in timelapse mode
Re-enabled ISO setting - tests show (in EXIF data of test jpegs) you can set between 100 and 800.
Added the option to save the raw data as RGB888. This requires a change to the firmware.
Fixed up preview mode to use a null sink rather than not connecting
components. Fixes the darkening frames in timelapse mode problem.
Merge pull request #58 from JamesH65/iso_fix

Re-enabled ISO setting
Merge pull request #61 from JamesH65/raw_rgb

Added the option to save the raw data as RGB888.
Merge pull request #62 from JamesH65/new_preview

Fix for dark frames in timelapse
Fix for compile fault due to mising change in the RaspiPreview.h header file.
Merge pull request #65 from JamesH65/compile_fix

Fix for compile fault due to mising change in the RaspiPreview.h header ...