Add a porting doc and make a pass over the others.

Fixes #5

README.md

@@ -11,50 +11,52 @@
 	- [Supported MCUs](#supported-mcus)
 	- [Toolchains](#toolchains)
 - [Getting Started](#getting-started)
+- [Uses](#uses)
+- [Porting](#porting)
 - [License](#license)
-- [How Can I Help](#how-can-i-help)
-	- [Donate Time](#donate-time)
-	- [Donate Money](#donate-money)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
 tinyusb is an open-source (BSD-licensed) USB Host/Device/OTG stack for embedded micro-controllers, especially ARM MCUs. It is designed to be user-friendly in term of configuration and out-of-the-box running experience.
 
-In addition to running without an RTOS, tinyusb is an OS-awared stack that can run across RTOS vendors. For the purpose of eliminating bugs as soon as possible, the stack is developed using [Test-Driven Development (TDD)](tests/readme.md) approach. More documents and API reference can be found at http://docs.tinyusb.org
+In addition to running without an RTOS, tinyusb can run across multiple RTOS vendors. More documents and API reference can be found at http://docs.tinyusb.org
 
 ![tinyusb diagram](http://docs.tinyusb.org/images/tinyusb_overview.png)
 
 ## Features ##
 
-### Host ###
-
-- HID Mouse
-- HID Keyboard
-- HID Generic (comming soon)
-- Communication Device Class (CDC)
-- Mass Storage Class (MSC)
-- Hub currnetly only support 1 level of hub (due to my laziness)
-
 ### Device ###
 
 - HID Mouse
 - HID Keyboard
-- HID Generic (comming soon)
+- HID Generic
 - Communication Class (CDC)
 - Mass Storage Class (MSC)
 
+### Host ###
+
+** Most active development is on the Device stack. The Host stack is largely untested.**
+
+- HID Mouse
+- HID Keyboard
+- HID Generic (coming soon)
+- Communication Device Class (CDC)
+- Mass Storage Class (MSC)
+- Hub currently only support 1 level of hub (due to my laziness)
+
 ### RTOS ###
 
 Currently the following OS are supported with tinyusb out of the box with a simple change of CFG_TUSB_OS macro.
 
 - **None OS**
 - **FreeRTOS**
-- **CMSIS RTX**
+- **MyNewt**
 
 ### Toolchains ###
 
 You can compile with any of following toolchains, however, the stack requires C99 to build with
 
+- GCC
 - lpcxpresso
 - Keil MDK
 - IAR Workbench
@@ -67,6 +69,9 @@ The stack supports the following MCUs
   - LPC13uxx (12 bit ADC)
   - LPC175x_6x
   - LPC43xx
+  - MicroChip SAMD21
+  - MicroChip SAMD51
+  - Nordic nRF52840
 
 [Here is the list of supported Boards](boards/readme.md) in the code base
 
@@ -74,6 +79,17 @@ The stack supports the following MCUs
 
 [Here is the details for getting started](doxygen/getting_started.md) with the stack.
 
+## Uses ##
+
+TinyUSB is currently used by these other projects:
+
+* [nRF52840 UF2 Bootloader](https://github.com/adafruit/Adafruit_nRF52_Bootloader)
+* [CircuitPython](https://github.com/adafruit/circuitpython)
+
+## Porting ##
+
+Want to help add TinyUSB support for a new MCU? Read [here](doxygen/porting.md) for an explanation on the low-level API needed by TinyUSB.
+
 ## License ##
 
 BSD license for most of the code base, but each file is individually licensed especially those in *vendor* folder. Please make sure you understand all the license term for files you use in your project. [Full license is here](tinyusb/license.md)