BLD: Add metadata to ESMPy pyproject.toml

Authors taken from setup.py before #58.
One URL taken from setup.py, others taken from that page.
Classifiers added by me.

Closes #140

src/addon/esmpy/pyproject.toml

@@ -7,6 +7,25 @@ name = "esmpy"
 description = "ESMF Python interface"
 # readme = "README.md"
 maintainers = [ { name = "ESMF Core Team", email = "[email protected]" } ]
+authors = [
+    { name = "University Corporation for Atmospheric Research" },
+    { name = "Massachusetts Institute of Technology" },
+    { name = "Geophysical Fluid Dynamics Laboratory" },
+    { name = "University of Michigan" },
+    { name = "National Centers for Environmental Prediction" },
+    { name = "Los Alamos National Laboratory" },
+    { name = "Argonne National Laboratory" },
+    { name = "NASA Goddard Space Flight Center" },
+]
+classifiers = [
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: University of Illinois/NCSA Open Source License",
+    "Programming Language :: Python :: 3 :: Only",
+    "Topic :: Scientific/Engineering :: Atmospheric Science",
+    "Topic :: Scientific/Engineering :: Oceanography",
+    "Topic :: Software Development :: Libraries :: Application Frameworks",
+]
 requires-python = ">=3.7"
 license = { text = "University of Illinois-NCSA" }
 dependencies = [
@@ -28,6 +47,12 @@ testing = [
     "pytest-json-report",
 ]
 
+[project.urls]
+Homepage = "http://earthsystemmodeling.org/esmpy/"
+Documentation = "https://earthsystemmodeling.org/esmpy_doc/release/latest/html/"
+sourcecode = "https://github.com/esmf-org/esmf/tree/develop/src/addon/esmpy"
+releasenotes = "https://earthsystemmodeling.org/static/releases.html"
+
 [tool.setuptools-git-versioning]
 enabled = true
 template = "{tag}"