add links for shields

Author: Teque5

README.md

@@ -1,8 +1,8 @@
 <p align="center"><img src="https://github.com/sigmf/SigMF/blob/v1.2.0/logo/sigmf_logo.png" alt="Rendered SigMF Logo"/></p>
 
-![Read the Docs](https://img.shields.io/readthedocs/sigmf)
-![PyPI - Downloads](https://img.shields.io/pypi/dm/sigmf)
-![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/sigmf/sigmf-python/main.yml)
+[![Read the Docs](https://img.shields.io/readthedocs/sigmf)](https://sigmf.readthedocs.io/en/latest/)
+[![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/sigmf/sigmf-python/main.yml)](https://github.com/sigmf/sigmf-python/actions?query=branch%3Amain)
+[![PyPI - Downloads](https://img.shields.io/pypi/dm/sigmf)](https://pypi.org/project/SigMF/)
 
 This python module makes it easy to interact with Signal Metadata Format
 (SigMF) recordings. This module works with Python 3.7+ and is distributed

pyproject.toml

@@ -7,6 +7,7 @@ classifiers = [
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -23,7 +24,13 @@ dependencies = [
     "jsonschema",   # for spec validation
 ]
     [project.urls]
-    repository = "https://github.com/sigmf/sigmf-python"
+    Repository = "https://github.com/sigmf/sigmf-python"
+    Documentation = "https://sigmf.readthedocs.io/en/latest/"
+    Issues = "https://github.com/sigmf/sigmf-python/issues"
+    Specification (HTML) = "https://sigmf.org/"
+    Specification (PDF) = "https://sigmf.github.io/SigMF/sigmf-spec.pdf"
+    Specification (Repo) = "https://github.com/sigmf/SigMF"
+
     [project.scripts]
     sigmf_validate = "sigmf.validate:main"
     sigmf_convert_wav = "sigmf.apps.convert_wav:main [apps]"