[install] add CHANGELOG for release 1.00.00 (this is the first release of the MG5aMC CUDACPP plugin)

Author: valassi

epochX/cudacpp/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com).
+
+--------------------------------------------------------------------------------
+
+## [1.00.00] - 2024-10-02
+
+### Added
+
+- (OM+AV+SR+SH+ZW+JT+DM) First release of the MG5aMC CUDACPP plugin.
+  > Validated and released for MG5aMC version 3.6.0.
+  > Hosted in the https://github.com/madgraph5/madgraph4gpu original repo,
+    using the original directory structure (plugin is epochX/cudacpp/CODEGEN/PLUGIN/CUDACPP_SA_OUTPUT).
+
+--------------------------------------------------------------------------------
+
+[1.00.00] https://github.com/madgraph5/madgraph4gpu/releases/tag/cudacpp_for3.6.0_v1.00.00