Add long description when publish pypi (microsoft#317)

# Description

Add long description when publish pypi.

# All Promptflow Contribution checklist:
- [x] **The pull request does not introduce [breaking changes]**
- [x] **CHANGELOG is updated for new features, bug fixes or other
significant changes.**
- [x] **I have read the [contribution guidelines](../CONTRIBUTING.md).**

## General Guidelines and Best Practices
- [x] Title of the pull request is clear and informative.
- [x] There are a small number of commits, each of which have an
informative message. This means that previously merged commits do not
appear in the history of the PR. For more information on cleaning up the
commits in your PR, [see this
page](https://github.com/Azure/azure-powershell/blob/master/documentation/development-docs/cleaning-up-commits.md).

Co-authored-by: cs_lucky <[email protected]>

src/promptflow-tools/setup.py

@@ -25,10 +25,15 @@ def parse_requirements(file_name: str) -> List[str]:
 if not version:
     raise RuntimeError("Cannot find version information")
 
+with open("README.md", encoding="utf-8") as f:
+    readme = f.read()
+
 setup(
     name=PACKAGE_NAME,
     version=version,
     description="Prompt flow built-in tools",
+    long_description_content_type="text/markdown",
+    long_description=readme,
     author="Microsoft Corporation",
     classifiers=[
         "Programming Language :: Python :: 3",
@@ -42,4 +47,8 @@ def parse_requirements(file_name: str) -> List[str]:
         "package_tools": ["builtins = promptflow.tools.list:list_package_tools"],
     },
     include_package_data=True,
+    project_urls={
+        "Bug Reports": "https://github.com/microsoft/promptflow/issues",
+        "Source": "https://github.com/microsoft/promptflow",
+    },
 )