Update README.md

Author: Ayla Khan

README.md

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+Forward/Inverse Toolkit
+=======================
+
+The SCIRun ECG Forward/Inverse Toolkit is a collection of modules and networks within the
+SCIRun system which can be used to solve forward and inverse electrocardiography problems.
+
+The Networks folder contains the toolkit's SCIRun networks.
+
+Please download the latest version of SCIRun5 as a binary or source code from this link:
+
+## SCIRun 5
+https://github.com/SCIInstitute/SCIRun