Added GNU GPL 3 license.

README.md

@@ -2,12 +2,14 @@
 
 ## License
 
+This software is released under GNU General Public License, Version 3. The full license text is provided in the
+file license.txt included in this repository or can be obtained from http://www.gnu.org/licenses/
 
 ## Content of this project
 
 This project contains the software developed for the paper:
 
-**Monotonicity-based shape reconstruction for an inverse scattering problem in a waveguide** 
+*Monotonicity-based shape reconstruction for an inverse scattering problem in a waveguide* 
 
 by T. Arens, R. Griesmaier, and R. Zhang.
 
@@ -22,7 +24,7 @@ The code is in the Matlab programming language.
 The following additional software is necessary to run the code in this project:
 - [ ] a recent version of Matlab,
 - [ ] the BIEPack Matlab library for solving boundary integral equations (TODO: Provide link),
-- [ ] the export_fig Matlab package, available from (https://github.com/altmany/export_fig)
+- [ ] the export_fig Matlab package, available from https://github.com/altmany/export_fig
 
 Set the Matlab path so that the BIEPack files and export_fig will be found.
 
@@ -33,22 +35,22 @@ All programs are contained in the src/ directory. The plots for the paper are cr
 
 Below is a brief description of each program file. See the individual program files for a detailed explanations.
 
-***src/plot_of_figure_?.m***
+**src/plot_of_figure_?.m**
 
 These are the driver files to create the plots in section 6 of the paper (Figures 6.1, 6.2 and 6.3). These
 programs are called without any parameters and will produce the plots in these figures in PNG format.
 
-***src/operator_N.m***
+**src/operator_N.m**
 
 This program computes a discretization of the near field operator for a scattering problem using the BIEPack
 library. A number of scattering problems are solved and the scattered field is evaluated in certain receiver
 points. These values form the column of the near field matrix that is returned by this function. 
 
-***src/indicator_func.m***
+**src/indicator_func.m**
 
 For a grid of points, this function computed the value of the indicator function proposed in the paper. 
 
-***src/operator_T_B.m***
+**src/operator_T_B.m**
 
 The indicator function uses the difference of the real part of the near field operator and the test operator 
 T_B. Given some point and the dimensions of the test domain, a discretization of this test operator is