Add License and CoC sections.

CONTRIBUTING.rst

@@ -4,7 +4,7 @@ How to contribute to Flask
 
 Thank you for considering contributing to Flask!
 
-* `Code of Conduct <CODE_OF_CONDUCT.md>`_
+* `Code of Conduct <CODE_OF_CONDUCT.rst>`_
 * `Support Questions`_
 * `Reporting issues`_
 * `Submitting patches`_
@@ -17,7 +17,7 @@ Thank you for considering contributing to Flask!
 Support questions
 #################
 
-Please don't use the issue tracker for this. The issue tracker is a tool
+Please don't use the issue tracker for support questions. The issue tracker is a tool
 to address bugs and feature requests in Flask itself. Use one of the
 following resources for questions about using Flask or issues with your
 own code:

README.rst

@@ -10,7 +10,7 @@ application frameworks.
 Flask offers suggestions, but doesn't enforce any dependencies or
 project layout. It is up to the developer to choose the tools and
 libraries they want to use. There are many extensions provided by the
-community that make adding new functionality easy.
+community that makes adding new functionality easy.
 
 .. _WSGI: https://wsgi.readthedocs.io/
 .. _Werkzeug: https://werkzeug.palletsprojects.com/
@@ -80,3 +80,11 @@ Links
 -   Website: https://palletsprojects.com/p/flask/
 -   Twitter: https://twitter.com/PalletsTeam
 -   Chat: https://discord.gg/pallets
+
+
+License
+-------
+
+Flask is licensed under the `BSD 3-Clause Revised License`_.
+
+.. _BSD 3-Clause Revised License: https://github.com/pallets/flask/blob/main/LICENSE.rst