added prototype f072 materials and new readme

LICENSE.txt

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+Creative Commons Attribution Share Alike
+
+https://creativecommons.org/licenses/by-sa/3.0/
+

README.md

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-# gex-hardware
-GEX custom hardware sources and docs
+GEX hardware
+============
+
+This repository contains source files and materials for all custom GEX hardware.
+
+[CC BY SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/)

f072-hub-r.1/GEX_Dongle.PrjPCBStructure

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+Record=TopLevelDocument|FileName=GEX_Dongle.SchDoc

f072-hub-r.1/README.md

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+GEX F072 hub prototype board
+============================
+
+This board was the first custom PCB for GEX.
+
+To flash a firmware, remove JP1, reset and flash using DFU. Replace JP1 and reset for normal operation.
+
+Press and hold S1 to enable USB VFS with config files. Same process for locking and persisting to Flash.
+Settings (but not system settings) can also be changed via the USB API.
+
+![photo](photo.jpg)
+
+Errata
+------
+
+*which is an euphemnism for bugs*
+
+- JP1 - bad footprint, too fine pitch. Can be fixed by soldering the header on the bottom, with slightly bent pins
+- P1 - the SWD connector, same problem, no fix needed or available. Use DFU for flashing
+- Missign NRESET button. Normally not needed, but often missed. You can solder it on the bottom side from one end of R2 to the GND testpoint.
+
+![photo](bugfixes.jpg)