Added NumFOCUS to pandas event sponsors (as per our pandas event website).

Created numfocus.md - new sponsor file.
Added numfocus.png - sponsor logo.

Author: Tomasz-Kluczkowski

_posts/2018-03-10-Pandas-Documentation-Sprint.md

@@ -14,6 +14,7 @@ image: static/images/events/pandas_documentation_sprint_1280_720px.jpg
 sponsors: 
     - bloomberg
     - python_software_foundation
+    - numfocus
 ---
 
 Pandas is an open source Python library for data manipulation and analysis. Its popularity is skyrocketing, and it is becoming the de-facto standard for data science and data engineering. But the number of core developers and contributors did not grow as fast as its popularity, and things like the API documentation would benefit from some help.

_sponsors/numfocus.md

@@ -0,0 +1,8 @@
+---
+sponsor_id: numfocus
+sponsor_name: "NumFOCUS"
+sponsor_logo: static/images/sponsors/numfocus.png
+sponsor_link: https://www.numfocus.org/
+permanent: false
+---
+NumFOCUS is a non-profit based in Austin, Texas. Their mission is to promote high-quality, reproducible scientific research by supporting open source scientific computing and data science projects. They are sponsors for such projects as Pandas, Numpy, Jupyter and many more.