Added doc/nanos-getting-started.md for basic background information and links.

doc/nanos-getting-started.md

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+# Some Background for getting started developing for Nano S
+
+### Relevent Repositories
+
+**The development SDK:** contains header and library files for compiling
+Nano S applications.  Located at:
+[LedgerHQ/nanos-secure-sdk](https://github.com/LedgerHQ/nanos-secure-sdk).
+
+**Python Tools for Ledger Blue and Nano S:** These contain tools for loading
+apps onto the Nano S, and basic communication between Nano S and a python
+interface on the computer.  Located at:
+[LedgerHQ/blue-loader-python](https://github.com/LedgerHQ/blue-loader-python).
+
+**Sample Apps:** These provide examples of basic operations on the Nano S
+device. Located at:
+[LedgerHQ/blue-sample-apps](https://github.com/LedgerHQ/blue-sample-apps).
+
+### Documentation
+
+Comprehensive developer documentation does not seem to be available yet (but
+is expected).  Some very good general overview information for developers on
+the way the BOLOS operating system and apps work and interact is located
+here, however:
+[Ledger Documentation Hub](http://ledger.readthedocs.io/en/latest/index.html).
+
+A tutorial for building, installing, and running the Hello World sample app
+is located here: (part of the docs mentioned above)
+[Getting started](http://ledger.readthedocs.io/en/latest/nanos/setup.html).
+It may be slightly out of date.