feat: add prompt file

1a403da-add-command-update-changelog-from-git-diff.md

1a403da-add-command-update-changelog-from-git-diff.md

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+---
+title: Add command update changelog from git diff
+state: completed
+---
+
+Read the AGENTS.md and README.md to get understanding of the project.
+
+Add a new command `update-changelog-with-llm`.
+
+This command reads the `CHANGELOG.md` and the staged git diff. Then it updates the `CHANGELOG.md` with the changes made and adds the file to the staged changes.
+
+Add the new commands to the `library.md` in the LLM section. Then run `task update-template`.