Adding the PSF (#88)

Note that I just link directly to FOSS Foundations for some information

organizations/psf.md

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+# Python Software Foundation
+
+- *Homepage*: [PSF](https://www.python.org/psf-landing/), [Python](https://www.python.org)
+- *Contact*: [Deb Nicholson](https://www.linkedin.com/in/denicholson)
+- *FOSS Foundation Info*: https://fossfoundation.info/foundations/python
+
+The PSF is the 501(c)(3) that manages the Python ecosystem and language, runs the annual PyCon conference, runs infrastructure for Python, and fiscally hosts many related subprojects.
+
+They're part of a wider group of language-specific charities, such as the Rust Foundation or the PHP Foundation.
+