* added readme file

README.md

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+RIOT OS
+=======
+RIOT - The revolutionary IoT OS!
+
+RIOT OS is an operating system for Internet of Things (IoT) devices. It is basesed on a microkernel and designed for
+* energy efficiency
+* hardware independent development
+* a high degree of modularity
+
+Its features comprise
+* a preemptive, tickless scheduler with priorities
+* flexible memory managment
+* high resolution timers
+* virtual, long-term timers
+* FAT file system
+* logging system
+* Wiselib support (C++ algorithm library, including routing, clustering, timesync, localization, security and more algorithms)
+* IPv6
+* TCP and UDP
+* 6LoWPAN
+* RPL