Add some ChangeLog.

ChangeLog

+	v0.3
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+	Port library to Windows (Visual Studio).
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+	Support building with CMake.
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+	Benchmarking target using ECHAM data (make bench)
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+
+2014-02-12  Mathis Rosenhauer  <rosenhauer@dkrz.de>
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+	v0.2
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+	Fixed incorrect length calculation in assessment of Second
+	Extension coding.
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+	Unlimited encoding of fundamental sequences.
+
+	Additional testing with official CCSDS sample data.
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+	Handle corrupted compressed data more gracefully.
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+	Support restricted coding options from latest standard.
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+	Facilitate generation of SIMD instructions by compiler.
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+2013-05-21  Mathis Rosenhauer  <rosenhauer@dkrz.de>
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+	Initial relaease: v0.1.