adding readme.md

README.md

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-# qcdloop
-Object-oriented one-loop scalar Feynman integrals framework
+![alt text](https://github.com/scarrazza/qcdloop/raw/master/resources/logo.png "Logo QCDLoop")
+
+QCDLoop: an object-oriented one-loop scalar Feynman integrals framework
+
+# General information
+
+Homepage with library description: http://cern.ch/qcdloop
+
+If you use this code in your publication, please cite
+[arXiv:0712.1851](http://arxiv.org/abs/0712.1851) and
+[arXiv:16xx.xxxxx](http://arxiv.org/abs/16xx.xxxxx).
+
+## Download
+
+You can obtain QCDLoop releases directly from the github repository:
+
+https://github.com/scarrazza/qcdloop/releases
+
+For the last development version you can clone the master code:
+
+```Shell
+git clone https://github.com/scarrazza/qcdloop.git
+```
+
+For the latest tag:
+
+```Shell
+git tag -l
+git checkout tags/tag_name
+```
+
+## Installation 
+
+Checkout the code and compile the code using the
+following procedure:
+
+```Shell
+cd qcdloop
+./configure --prefix=/where/install/qcdloop #(optional)
+make && make install
+```
+
+By the default, if prefix is not set the program is installed in
+/usr/local. If you define a custom prefix, remember to export
+qcdloop/lib to the LD_LIBRARY_PATH. QCDLoop requires a compiler with
+C++11 and quadmath features (e.g. gcc >= 4.7)
+
+## Contact Information
+
+Maintainer: Stefano Carrazza