added config files, and nsxiv

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+img2data
+--------
+
+img2data is a helper program to convert images to binary data for embedding in
+software. The generated data is used in nsxiv to set the window icons.
+
+
+How It Works
+------------
+
+Each given image is compressed using run-length encoding and a data array is
+generated. In these arrays, the four high bits of each byte are the run length
+minus one and the lowest four bits are the data, which are indices for the
+color array.
+
+See `data.gen.h` or the output of img2data for a better understanding.
+
+
+Dependencies
+------------
+
+img2data requires Imlib2 to be installed.
+
+
+Building
+--------
+
+img2data is built using the command:
+
+    $ CC -Wall -std=c89 -pedantic -lImlib2 img2data.c -o img2data
+
+where `CC` is a C compiler such as `gcc`.
+
+
+Usage
+-----
+
+img2data is used as the following:
+
+    $ ./img2data 16x16.png 32x32.png 48x48.png 64x64.png 128x128.png
+
+You may replace or omit any image, but you must have a `data.gen.h` with at
+least 1 image for nsxiv to compile.