docs: Created a CREDITS file to document the history and origins of Loki from the original AIChat project

CREDITS.md

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+# Credits
+
+## AIChat
+Loki originally started as a fork of the fantastic
+[AIChat CLI](https://github.com/sigoden/aichat). The initial goal was simply
+to fix a bug in how MCP servers worked with AIChat, allowing different MCP
+servers to be specified per agent. Since then, Loki has evolved far beyond
+its original scope and grown into a passion project with a life of its own.
+
+Today, Loki includes first-class MCP server support (for both local and remote
+servers), a built-in vault for interpolating secrets in configuration files,
+built-in agents and macros, dynamic tab completions, integrated custom
+functions (no external `argc` dependency), improved documentation, and much
+more with many more ideas planned for the future.
+
+Loki is now developed and maintained as an independent project. Full credit
+for the original foundation goes to the developers of the wonderful
+AIChat project.
+
+This project is not affiliated with or endorsed by the AIChat maintainers.
+
+## AIChat
+
+Loki originally began as a fork of [AIChat CLI](https://github.com/sigoden/aichat),
+created and maintained by the AIChat contributors.
+
+While Loki has since diverged significantly and is now developed as an
+independent project, its early foundation and inspiration came from the
+AIChat project.
+
+AIChat is licensed under the MIT License.