Update main docs README (#99)

* Update main docs README

* Add basic description back

* Headers and spacing

* Maker resources

* Link to DevicesApiTester

* More maker resources

* Added Device Bindings link

* Reordered interfaces

* Added Pine64 and reordered dev sections

* Added Autodesk EAGLE link

* Added dev board GitHub links

* Added instructables link

* Added KiCad link

* Added Hackaday link

* Added FreeCAD link

* Reordered dev boards and .NET Core notes to top

* heck wording

Documentation/README.md

 # Resources
-
 See the following resources to get started.
 
 ## .NET Core
-
-* [.NET Core documentation](https://docs.microsoft.com/dotnet/)
+* [.NET Core Documentation](https://docs.microsoft.com/dotnet/)
 * [Install .NET Core on Raspberry Pi](https://github.com/dotnet/core/blob/master/samples/RaspberryPiInstructions.md)
 * [.NET Core ARM64 Status](https://github.com/dotnet/announcements/issues/82)
 * [.NET Core Docker Samples](https://github.com/dotnet/dotnet-docker/tree/master/samples)
 
-## Raspberry Pi
+## System.Device.* APIs
+
+* [Device Bindings](https://github.com/dotnet/iot/tree/master/src/devices) - Includes a collection of APIs representing a range of sensors, displays and human interface devices based on System.Device.* APIs.
+* [DevicesApiTester CLI](https://github.com/dotnet/iot/tree/master/tools/DevicesApiTester) - Helpful utility, based on System.Device.* APIs, that include various commands for testing connected development boards and external hardware.
+
+## Interface Knowledge Base
+### General-Purpose Input/Output (GPIO)
+* [GPIO Wiki](https://en.wikipedia.org/wiki/General-purpose_input/output)
+* [Digital I/O Fundamentals](http://www.ni.com/white-paper/3405/en/#toc1)
+
+### Inter-Integrated Circuit (I2C)
+* [I2C Wiki](https://en.wikipedia.org/wiki/I%C2%B2C)
+* [I2C Tutorial](https://learn.sparkfun.com/tutorials/i2c/all)
+
+### Serial Peripheral Interface (SPI)
+* [SPI Wiki](https://en.wikipedia.org/wiki/Serial_Peripheral_Interface)
+* [SPI Tutorial](https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi/all)
 
+## Development Boards
+**NOTE**: It has been verified that .NET Core will work on the following development boards.  However, there has only been limited testing so far.  It is recommended you experiment with the Raspberry Pi 3 and HummingBoard for now.
+
+### Raspberry Pi
+#### General
+* [Raspberry Pi Website](https://www.raspberrypi.org/)
+* [Raspberry Pi GitHub Website](https://github.com/raspberrypi)
+* [Raspberry Pi Wiki](https://en.wikipedia.org/wiki/Raspberry_Pi)
+* [Raspberry Pi GPIO Pinout](https://learn.sparkfun.com/tutorials/raspberry-gpio/gpio-pinout)
+* [Raspberry Pi GPIO Tutorial](https://learn.sparkfun.com/tutorials/raspberry-gpio/all)
+
+#### How-Tos
 * [Enable SPI on Raspberry Pi](https://www.raspberrypi-spy.co.uk/2014/08/enabling-the-spi-interface-on-the-raspberry-pi/)
 * [Enable I2C on Raspberry Pi](https://www.raspberrypi-spy.co.uk/2014/11/enabling-the-i2c-interface-on-the-raspberry-pi/)
-* [Enable headless Raspberry Pi](https://hackernoon.com/raspberry-pi-headless-install-462ccabd75d0)
+* [Enable Headless Raspberry Pi](https://hackernoon.com/raspberry-pi-headless-install-462ccabd75d0)
+* [Docker Access to Raspberry Pi GPIO Pins](https://stackoverflow.com/questions/30059784/docker-access-to-raspberry-pi-gpio-pins)
+* [Design a Raspberry Pi Hat in 10 Minutes](https://www.youtube.com/watch?v=1P7GOLFCCgs)
 
-## GPIO
+#### Products
+* [Raspberry Pi 3 Model B+](https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/)
 
-* [Docker Access to Raspberry Pi GPIO Pins](https://stackoverflow.com/questions/30059784/docker-access-to-raspberry-pi-gpio-pins)
+### HummingBoard
+#### General
+* [SolidRun Website](https://www.solid-run.com/)
+* [SolidRun GitHub Website](https://github.com/SolidRun)
+
+#### Products
+* [HummingBoard](https://www.solid-run.com/nxp-family/hummingboard/)
+
+### BeagleBoard
+#### General
+* [BeagleBoard Website](https://beagleboard.org/bone)
+* [BeagleBoard GitHub Website](https://github.com/beagleboard)
+* [BeagleBoard Wiki](https://en.wikipedia.org/wiki/BeagleBoard)
+
+#### How-Tos
+* [Example of .NET Core on a BBB](https://github.com/Redouane64/beaglebone-dotnet/tree/master/Examples/LEDBlink)
+
+#### Products
+* [BeagleBone Black (BBB)](https://beagleboard.org/black)
+* [BeagleBone Green (BBG)](https://beagleboard.org/green)
+
+### Pine64
+#### General
+* [Pine64 Website](https://www.pine64.org/)
+
+#### Products
+* [PINE A64-LTS](https://www.pine64.org/?page_id=46823)
+
+## Maker Resources
+
+### Prototyping
+#### How-Tos
+* [Collin's Lab: Breadboards & Perfboards](https://www.youtube.com/watch?v=w0c3t0fJhXU)
+* [How to Use a Breadboard](https://www.youtube.com/watch?v=6WReFkfrUIk)
+
+#### Software
+* [Autodesk EAGLE PCB Designing Software](https://www.autodesk.com/products/eagle/free-download)
+* [FreeCAD](https://www.freecadweb.org/downloads.php)
+* [Fritzing](http://fritzing.org/home/)
+* [KiCad EDA](http://kicad-pcb.org/)
+
+### Social
+* [Hackaday.io](https://hackaday.io/)
+* [hackster.io](https://www.hackster.io/)
+* [instructables](https://www.instructables.com/)
+
+### Vendors
+* [Adafruit](https://www.adafruit.com/)
+* [CanaKit](https://www.canakit.com/)
+* [Digikey](https://www.digikey.com/)
+* [Jameco Electronics](https://www.jameco.com)
+* [Sparkfun Electronics](https://www.sparkfun.com)
+* [SunFounder](https://www.sunfounder.com/)
\ No newline at end of file