docs(sprints): add Apache Airflow (#1437)

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Author: Lee-W

src/content/sprints/apache_airflow.md

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+---
+title: "Apache Airflow"
+numberOfPeople: "TBA"
+pythonLevel: "Intermediate"
+contactPerson:
+  name: "Wei Lee"
+  email: "[email protected]"
+links:
+  - title: "Apache Airflow"
+    url: "https://github.com/apache/airflow"
+  - title: "Airflow Breeze CI environment"
+    url: "https://github.com/apache/airflow/tree/main/dev/breeze/doc"
+---
+
+Apache Airflow is a platform that allows you to programmatically create,
+schedule, and monitor workflows. In this development sprint, we will guide you
+through the setup of your development environment, help you identify a suitable
+issue to work on and assist you in making your first contribution to Airflow! It
+is strongly recommended to follow through at
+[Airflow Breeze CI environment](https://github.com/apache/airflow/tree/main/dev/breeze/doc)
+since downloading Docker images can be quite time-consuming. If you encounter
+any issues, please feel free to ask questions in
+<https://airflow.apache.org/community/>.