Add changelog

Author: mm2

ChangeLog

@@ -1,6 +1,21 @@
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-2.19 Ongoing
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+2.19 Featured release
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+CMake build system. Thanks to Vlad Erium for the initial implementation and kmilos for improvements. 
+Large files support to use profiles up to 4Gb
+Black point compensation works on multi-channel profiles
+Added more test platforms/architectures in GitHub tests, Cygwin and MSYS are now fully checked.
+jpgicc banner is not shown on normal operation, only when help is requested.
+Added a way to access internal transform pipelines. For read only.
+Add a way to retrieve the CMM signature
+Added extra checks on postscript undocumented functions
+Added guard on integer overflow when reading .cube files
+Added unneeded checks as a try to get rid of spam reports about "vulnerabilities" that are not real.
+Utility program names generated by Visual Studio 2026 are now same as all other platforms.
+Creating an output profile by cmsTransform2DeviceLink does not propagate correctly the colorant table. Fixed.
+Added some profile class definitions from iccMAX
+Deprecated uint16 and uint32 types removed from tiffdiff
+
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 2.18 Maintenance release
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