Add useful links to the abseil-py public files

Add a link to changelog to pyproject.toml so that it will be shown on
the PyPI page. Add project badges to README with useful info and links.

PiperOrigin-RevId: 763757015

Author: AleksMat

README.md

@@ -1,3 +1,10 @@
+[![Package version](https://img.shields.io/pypi/v/absl-py)](https://pypi.org/project/absl-py)
+[![Supported Python versions](https://img.shields.io/pypi/pyversions/absl-py.svg?style=flat-square)](https://pypi.org/project/absl-py)
+[![License](https://img.shields.io/github/license/abseil/abseil-py)](https://github.com/abseil/abseil-py/blob/main/LICENSE)
+[![Build Status](https://github.com/abseil/abseil-py/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/abseil/abseil-py/actions)
+[![Overall downloads](https://pepy.tech/badge/absl-py)](https://pepy.tech/project/absl-py)
+[![Last month downloads](https://pepy.tech/badge/absl-py/month)](https://pepy.tech/project/absl-py)
+
 # Abseil Python Common Libraries
 
 This repository is a collection of Python library code for building Python

pyproject.toml

@@ -28,7 +28,10 @@ classifiers = [
 ]
 
 [project.urls]
-Homepage = "https://github.com/abseil/abseil-py"
+Changelog = "https://github.com/abseil/abseil-py/blob/main/CHANGELOG.md"
+Documentation = "https://abseil.io/docs/python/"
+Issues = "https://github.com/abseil/abseil-py/issues"
+Source = "https://github.com/abseil/abseil-py"
 
 [tool.hatch.version]
 path = "absl/__init__.py"