update README

README.md

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 # mcuboot
-MCU boot loader
+
+## Overview
+
+MCUBoot is a secure bootloader for 32-bit MCUs.   The goal of MCUBoot is to 
+define a common infrastructure for the bootloader, system flash layout on 
+microcontroller systems, and to provide a secure bootloader that enables 
+easy software upgrade.
+
+MCUboot is operating system and hardware independent, and relies on 
+hardware porting layers from the operating system it works with.  Currently
+mcuboot works with both the Apache Mynewt, and Zephyr operating systems, but
+more ports are planned in the future.
+
+## Roadmap
+
+The MCUBoot project was originally taken from the Apache Mynewt operating system,
+which had secure boot and software upgrade functionality instrinsic to it.  Currently
+development is heads down on a first release of MCUboot that works across both the 
+Zephyr operating system and Apache Mynewt operating system.
+
+For more information on what's being planned, and worked on, please visit: 
+
+https://runtimeco.atlassian.net/projects/MCUB/summary
+
+## Browsing 
+
+Information and documentation on the bootloader is stored within the source, and on confluence:
+
+https://runtimeco.atlassian.net/wiki/discover/all-updates
+
+For more information in the source, here are some pointers: 
+
+- [boot/bootutil][https://github.com/runtimeco/mcuboot/tree/master/boot/bootutil]: The core of the bootloader itself.
+- [boot/boot\_serial][https://github.com/runtimeco/mcuboot/tree/master/boot/boot_serial]: Support for serial upgrade within the bootloader itself.
+- [boot/zephyr][https://github.com/runtimeco/mcuboot/tree/master/boot/zephyr]: Port of the bootloader to Zephyr
+- [imgtool][https://github.com/runtimeco/mcuboot/tree/master/imgtool]: A tool to securely sign firmware images for booting by mcuboot.
+- [sim][https://github.com/runtimeco/mcuboot/tree/master/sim]: A bootloader simulator for testing and regression
+
+## Joining 
+
+Developers welcome!  To join in the discussion, please join the developer mailing list: 
+
+https://runtimeco.mobilize.io/registrations/groups/9881