Rtos API example

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+# How to contribute
+
+This directory structure contains some repositories that are copied from external sources.
+
+Please follow these instructions to send contributions to master repositories.
+
+## Directory structure
+
+This directory consists of following modules
+
+* [coap-service](#coap-service)
+* [mbed-mesh-api](#mbed-mesh-api)
+* [nanostack-interface](#nanostack-interface)
+* [sal-stack-nanostack](#sal-stack-nanostack)
+
+## coap-service
+
+Master repository is located in the https://github.com/ARMmbed/coap-service
+
+Please send contributions against that repository.
+
+To test changes, remove the `coap-service` repository and replace with Git clone
+of the master repository.
+
+```
+rm -rf coap-service
+git clone git@github.com:ARMmbed/coap-service.git
+```
+
+## mbed-mesh-api
+
+This is the master source of mbed-mesh-api.
+Send contributions directly to this repository.
+
+## nanostack-interface
+
+This is the master source of nanostack-interface.
+Send contributions directly to this repository.
+
+## sal-stack-nanostack
+
+This directory holds binary libraries generated from the Nanostack networking library.
+
+**Only mbed Partners have access to the source code.**
+
+If you have access, the source directory is available in https://github.com/ARMmbed/sal-stack-nanostack-private
+
+You can replace the binary libraries with the source tree as follows:
+
+* Remove the sal-stack-nanostack directory: `rm -rf sal-stack-nanostack`
+* Remove the binaries located one directory up: `rm -rf ../nanostack-binaries`
+* Clone the original source repository to root folder of your application: `git@github.com:ARMmbed/sal-stack-nanostack-private.git`
+
+Now you can modify, build and test your changes with the mbed OS build.
+
+**NOTE:** You do not need to clone the Nanostack to exactly same location in the build tree. This may even cause build problems.
+
+### Instructions for generating the binary modules
+
+Check `Releasing.md` from the Nanostack source repository.