added .gitignore and README.md

.gitignore

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+testdir
+*.ipynb
+*.so
+*.swp
+*.swo
+__pycache__

README.md

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+# File Descriptions
+
+run_in_case_dir.sh              All-in-one script
+
+Compact.f90                     Compact FD scheme implemented in Fortran
+pycompact.py                    python wrapper class
+compact_doc.py                  print docstrings in f2py generated interface
+
+dnstool.py                      library for DNS postprocessing
+
+binning_v_given_c.py            calculate conditional mean by data binning 
+concatenate_cmean.py            concatenate all data binning results
+
+extract_all.py                  extract time and space dependent u, c, ddxc fields to single files
+extract_c.py                    extract only c
+extract_ddxc.py                 extract only ddxc
+extract_u.py                    extract only u
+
+fluctuation_product_u_ddxc.py   calculate product of conditional fluctuation field
+p_ddxc_given_c.py               calculate conditional pdf of ddxc given c using fastKDE
+p_u_given_c.py                  calculate conditional pdf of u given c using fastKDE
+
+sbatch-job-binning-ddxc-array   slurm sbatch script