Transform readme into better readable markdown

No content changes, just markdown for proper rendering instead of txt.

Author: lembergerth

c/xcsp/README.md

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+This programs are obtained by converting the benchmarks provided for the [XCSP_to_C tool][1] to C-programs.
+
+## Creation
+
+For converting and creating the .yml-files a python script was used.
+The script can be found in this directory (create_from_xmls.py) and needs libxml12-dev, libboost-dev and clang-format to be installed.
+  1) Building [the project][2] produces the executable [`test`][3].
+  2) Place the script in the directory of the executable.
+  3) Run
+  ```
+  >> python create_from_xmls.py /ABSOLUTE/path/to/benchmark/folder /ABSOLUTE/path/to/your/own/outputfolder
+  ```
+
+## Environment used
+
+  * Python: version 3.6.9
+  * OS: Ubuntu 18.4.
+  * g++: version 7.4.0
+
+[License](License)
+
+[1]: https://github.com/vsahil/XCSP3_to_C/tree/master/benchmarks
+[2]: https://github.com/vsahil/XCSP3_to_C
+[3]: https://github.com/vsahil/XCSP3_to_C/blob/master/README.md