Add README

README

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+This a tool to construct HDR-images from a series of photographs
+with different exposures.
+
+It reads JPEG-files and parses the EXIF data to retrieve the
+exposure times.
+
+
+Build:
+  make
+
+Run:
+  ./haader <image1.jpg> <image2.jpg> <image3.jpg> ...
+
+
+(Johannes Hofmann, johofman@st.ovgu.de)