savety net for gain settings, add readme, licence and ignore

README.md

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+# Minimal command line pylon recorder
+
+## building
+
+**tested with the pylon 7.4.0 and  pylon supplementary package for mpeg 4.1.0.1**
+
+1. clone git repository
+2. execute ``make``
+3. this should create a binary called ``minimal_pylon``
+4. if not executable do ``chmod a+x minimal_pylon``
+5. have fun
+
+## recording
+
+Just run it with ``./minimal_pylon``. It will use some defaults for resoultion, framerate, gain, etc
+and records 100 frames. There is a warning on the command line telling when frames need to long to be recorded.
+
+Run ``./minimal_pylon --help`` fro information about the supported settings:
+
+```
+❯ ./minimal_pylon --help
+Expected args:
+         --fps|-f        the framerate, defaults to 20 Hz
+         --help|?        this help
+         --width|-w      the image width in pixel, defaults to 2000
+         --height|-h     the image height in pixel, defaults to 2000
+         --xoffs|-x      image x offset in pixel, defaults to 0
+         --yoffs|-y      image y-offset in pixel, defaults to 0
+         --exposure|-e   exposure time in us, defaults to 10000
+         --gain1|-g1     gain for camera 1 in db, defaults to 5.0
+         --gain2|-g2     gain for camera 2 in db, defaults to 5.0
+         --cameras|-c    the desired number of cameras to grab at the same time, defaults to 1
+         --framecount|-n         the number of frames, defaults to 100
+         --quality|-q    the qualtiy of the compression (0 < q <= 100), defaults to 50
+         --index|-i      the camera index, ignored if cameras > 1, defaults to 0
+         --outfile|-o    the output filename
+
+```
+
+
+**Don't  complain, send a pull request!**
+