Initial version

README.md

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+# Citer
+
+Simple CLI that turns an arXiv ID/URL or DOI/URL into a single-line APA citation.
+
+## Setup
+
+```bash
+pip install -e .
+```
+
+## Usage
+
+```bash
+# arXiv IDs or URLs
+citer arxiv 2106.01342
+citer arxiv https://arxiv.org/abs/2106.01342
+
+# DOIs or DOI URLs
+citer doi 10.1038/nphys1170
+citer doi https://doi.org/10.1038/nphys1170
+```
+
+Errors are printed with a clear message if an ID cannot be parsed or a lookup fails.
+
+## Tests
+
+```bash
+python -m pytest
+```