Adding a CHANGELOG (#296)

[ROCm/rccl commit: bdd8adf1ca]

projects/rccl/CHANGELOG.md

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+# Change Log for RCCL
+
+Full documentation for RCCL is available at [https://rccl.readthedocs.io](https://rccl.readthedocs.io)
+
+## [Unreleased]
+### Optimizations
+- Performance improvements for Rome-based systems
+
+## [RCCL-2.7.8 for ROCm 3.9.0]
+### Added
+- Adding support for alltoallv RCCL kernel
+### Optimizations
+- Modifications to topology based on XGMI links
+### Known issues
+- None
+
+## [RCCL-2.7.6 for ROCm 3.8.0]
+### Added
+- Support for static library builds
+### Known issues
+- None
+
+## [RCCL-2.7.6 for ROCm 3.7.0]
+### Added
+- Updated to RCCL API version of 2.7.6
+- Added gather, scatter and all-to-all collectives
+
+## [RCCL-2.7.0 for ROCm 3.6.0]
+### Added
+- Updated to RCCL API version of 2.6.4
+
+## [RCCL-2.7.0 for ROCm 3.5.0]
+### Added
+- Compatibility with NCCL 2.6
+- Network interface improvements with API v3
+### Optimizations
+- Fixing issues and built time improvements for hip-clang
+- Network topology detection
+- Improved CPU type detection
+- Infiniband adaptive routing support
+### Changed
+- Switched to hip-clang as default compiler
+### Deprecated
+- Deprecated hcc build