Added READMEs

OmegaLeo.HelperLib.Changelog/README.md

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+# Omega Leo's Helper Library - Changelog
+Package to help with Changelog generation by providing a new Changelog attribute and a tool to extract a dictionary of the changelogs or the markdown for CHANGELOG.md
+
+Example attribute usage:
+```cs
+[Changelog("v1.0.0", "This is a test")]
+[Changelog("v1.0.1", "This is another test")]
+public class Test
+{
+    
+}
+```