docs: add README

README.md

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+# tectonic-api
+
+
+[![linting: pylint](https://img.shields.io/badge/linting-pylint-yellowgreen)](https://github.com/PyCQA/pylint)
+[![main.yml](https://github.com/winstxnhdw/tectonic-api/actions/workflows/main.yml/badge.svg)](https://github.com/winstxnhdw/tectonic-api/actions/workflows/main.yml)
+[![build.yml](https://github.com/winstxnhdw/tectonic-api/actions/workflows/build.yml/badge.svg)](https://github.com/winstxnhdw/tectonic-api/actions/workflows/build.yml)
+[![warmer.yml](https://github.com/winstxnhdw/tectonic-api/actions/workflows/warmer.yml/badge.svg)](https://github.com/winstxnhdw/tectonic-api/actions/workflows/warmer.yml)
+[![dependabot.yml](https://github.com/winstxnhdw/tectonic-api/actions/workflows/dependabot.yml/badge.svg)](https://github.com/winstxnhdw/tectonic-api/actions/workflows/dependabot.yml)
+
+A simple [axum](https://github.com/tokio-rs/axum) API for compiling TeX/LaTeX with [Tectonic](https://github.com/tectonic-typesetting/tectonic).
+
+## Usage
+
+Simply cURL the endpoint like in the following.
+
+```bash
+curl 'https://winstxnhdw-tectonic-api.hf.space/compile' \
+  -d '{
+  "latex": "\\documentclass{article}\\begin{document}Hello, world!\\end{document}"
+}'
+```
+
+## Development
+
+You can spin the server up locally with the following.
+
+```bash
+docker build -f Dockerfile.build -t tectonic-api .
+docker run --rm -e SERVER_PORT=5000 -p 5000:5000 tectonic-api
+```