Update README.md

Adding a description

README.md

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-# S3DK
-Smart Grid Synchrophasor Software Development Kit
+# S3DK (Smart Grid Synchrophasor Software Development Kit)
+
+## Overview
+
+S3DK is a software development toolkit to implement real-time PMU/Synchrophasor applications, such as thos used in Wide Area Monitoring Systems. 
+
+Using this development toolkit, a developer is able to manipulate the numerical values of the different signals contained in a synchrophasor data stream within the LabView environment. 
+This enables fast software prototyping and testing of applications.
+
+The software is comprised by two main parts: (a) a real-time data mediator that parses and handles PMU data (implemented in C++), and (b) a LabView User Interface (UI).
+
+## S3DK Components
+The LabView UI provides both easy connection with PMUs/PDCs and a "pallete" in LabView with different functional blocks that are used to interface the real time data with LabView functions.
+
+The real-time data mediator has a client/server architecture, and an advanced API that would allow its use in other development environments instead of LabView. 
+In addition, the real-time mediator has been build with several future functionalities in mind, such as a time-synchronization layer and multithreading.
+
+## S3DK - Why?
+Compliance with the IEEE C37.118.2 protocol means that a developer can directly connect to a synchrphasor stream from an individual PMU, or from multiple PMUs within a PDC output stream, thereby liberating them of the complexities involved synchrophasor data handling involved in dealing with the packets wrapped within the protocol.
+
+The toolkit provides a real-time data mediator that parses the IEEE C37.118.2 – 2011 protocol, and provides auxiliary functions (such as data windowing) implemented in C++.
+Nevertheless, this is transparent to the user who only has to provide the PMU/PDC configuration settings (i.e. IP address, etc) through a GUI.
+
+These features make the toolkit independent of any specific equipment, PDC and/or their manufacturers; therefore facilitating interoperability.
+
+## S3DK Applications
+Several applications have been implemented by KTH SmarTS Lab which will be realeased in the near future. For an overview, please see the following paper:
+M. S. Almas, M. Baudette, L. Vanfretti, S. L⊘vlund and J. O. Gjerde, "Synchrophasor network, laboratory and software applications developed in the STRONg2rid project," 2014 IEEE PES General Meeting | Conference & Exposition, National Harbor, MD, 2014, pp. 1-5.
+doi: 10.1109/PESGM.2014.6938835
+URL: [link](http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6938835&isnumber=6938773)
+
+## Citation:
+If you use our software, please cite the following paper:
+L. Vanfretti, V. H. Aarstrand, M. S. Almas, V. S. Perić and J. O. Gjerde, "A software development toolkit for real-time synchrophasor applications," PowerTech (POWERTECH), 2013 IEEE Grenoble, Grenoble, 2013, pp. 1-6.
+doi: 10.1109/PTC.2013.6652191
+URL: [link](http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6652191&isnumber=6652052)
+
+