Add release notes for 0.9.19

docs/releases/v0.9.19.md

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+## Version 0.9.19
+
+This release includes significant refactoring improvements to the LlamaBot, enhancing the setup of logging and database paths. These changes streamline the codebase and improve the maintainability of the system.
+
+### New Features
+
+- Centralized the database path resolution logic to reduce redundancy and improve maintainability. This update ensures that all modules uniformly manage database paths through a single utility function, enhancing the code's cleanliness and reducing potential errors. (0ece15b) (Eric Ma)
+- Implemented dynamic log level setting based on an environment variable and ensured the creation of necessary directories for database logging. This feature allows for more flexible and environment-specific logging configurations, which can be crucial for debugging and monitoring the application in different deployment scenarios. (2dba66b) (Eric Ma)
+
+### Bug Fixes
+
+- None in this release.
+
+### Deprecations
+
+- None in this release.