add AIR stuff from TUM

minor changes here and there

Libs/mutual information rate TUM/README.md

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+## MI-CG: Numerically Computing Achievable Rates of Memoryless Channels
+
+This repository provides a MATLAB function mi_cg.m to numerically compute achievable rates for memoryless channels. The function uses a conditionally-Gaussian (CG) channel model to obtain a lower bound on the achievable rate of the true channel. The method is well-known, and it is explained in [this short document](https://mediatum.ub.tum.de/node?id=1533663). Two example scripts that compute several achievable rate curves are also provided.
+
+### Citation
+
+This software and the accompanying document are meant as a tutorial to get started with mutual information as a numerical figure of merit for a communications channel. The software is provided under the open-source [MIT license](https://opensource.org/licenses/MIT). If you use the software in your academic work, please cite the accompanying [document](https://mediatum.ub.tum.de/node?id=1533663) as follows:
+
+> F. J. Garcia-Gomez, “Numerically computing achievable rates of memoryless channels,” TUM University Library, 2019. [Online]. Available: https://mediatum.ub.tum.de/node?id=1533663 
+
+The corresponding BibTeX entry is
+```
+@article{garcia2019numerically,
+	author = "Francisco Javier Garcia-Gomez",
+	title = "Numerically Computing Achievable Rates of Memoryless Channels",
+	year = "2019",
+	journal="TUM University Library",
+	url={https://mediatum.ub.tum.de/node?id=1533663}
+}
+```
+
+### Acknowledgment
+
+This work was supported by the German Research Foundation (DFG) under Grant KR 3517/8-2.