docs: add a badge block and link the README title to the docs site

[tschm]

Adds a badge block to the README, modelled on
jebel-quant/jquantstats and adapted
to this repo.

Badges

PyPI version · MIT licence · Python 3.11–3.14 · CI · Coverage · ruff · uv ·
CodeFactor · OpenSSF Scorecard · rhiza template ref · PyPI downloads · Paper

Every endpoint was probed for a 200 before being added, so none of them render
as a broken image. That mattered most for the ones that are specific to this repo
and could not simply be copied from the inspiration:

Badge	Verified target
Coverage	jebel-quant.github.io/quadprog/coverage-badge.svg → reports/html-coverage/
PyPI	the cvx-quadprog project, not quadprog
Paper	quadprog.pdf on the paper branch, published by rhiza_paper.yml
Rhiza	$.ref read live out of .rhiza/template.yml

CodeFactor was initially left out — the repo returned 404 there and a badge
pointing at an unregistered project is worse than no badge. It has since been
registered and now returns 200, so it is included.

The mutation badge is deliberately not here. rhiza_mutation.yml is the
workflow that would publish one, and it stays skipped in this repo (see the
comment at the top of .github/workflows/mutation.yml); the repo-owned mutation
job gates on a survivor baseline instead and publishes nothing to Pages.

H1

Same treatment as the inspiration — linked name plus a tagline:

# [cvx-quadprog](https://jebel-quant.github.io/quadprog): Goldfarb/Idnani QP in NumPy and SciPy

The tagline is a trimmed form of the description in pyproject.toml, so the
headline and the package metadata say the same thing rather than drifting apart.
The docs site is already declared at mkdocs.yml:6.

Verification

• make fmt — all 21 hooks pass, markdownlint included (MD013 is disabled, so the
  long badge lines are fine)
• make rhiza-test — 39 passed, 1 skipped; this is the suite that validates the
  README's bash fragments and Python blocks

Docs only — no source, test or config changes.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the project’s top-level README to improve presentation and discoverability by adding a badge block and linking the H1 title to the published documentation site.

Changes:

• Replace the plain # cvx-quadprog header with a linked H1 that includes a short tagline.
• Add a set of status/metadata badges (PyPI, license, Python versions, CI, coverage, tooling, etc.) near the top of the README.

Suppressed comments (1)

README.md:16

• There is an empty line before the Paper badge, which splits it into a new paragraph/row while the other badges are contiguous. If the goal is a single badge block, remove the blank line to keep the layout consistent.

[![Downloads](https://static.pepy.tech/personalized-badge/cvx-quadprog?period=month&units=international_system&left_color=black&right_color=orange&left_text=PyPI%20downloads%20per%20month)](https://pepy.tech/project/cvx-quadprog)

[![Paper](https://img.shields.io/badge/paper-quadprog.pdf-red?logo=adobeacrobatreader)](https://github.com/jebel-quant/quadprog/blob/paper/quadprog.pdf)

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