Merge pull request #1039 from nup002/master

Add Mathpad by Summa Cogni

Author: tannewt

1209/2211/index.md

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+---
+layout: pid
+title: Mathpad
+owner: Summa-Cogni
+license: GNU General Public License v3 and CERN-OHL-S v2
+site: http://www.summacogni.com/Mathpad
+source: https://github.com/Summa-Cogni/Mathpad
+---
+
+Mathpad is a keypad for students and professionals in any STEM field. 
+Mathpad allows for effortless typing of mathematical symbols and equations across applications and operating systems.
+
+Mathpad's firmware is built on QMK and licensed under GNU General Public License v3. 
+Its hardware is licensed under CERN-OHL-S v2
+
+Mathpad is OS agnostic and works with Windows, macOS, and virtually all Linux distros.

org/Summa-Cogni/index.md

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+---
+layout: org
+title: Summa Cogni
+site: http://www.summacogni.org/
+---
+A company founded and run by Magne Lauritzen. Summa Cogni aims to release useful open source hardware of high quality.