added ignore file

.gitignore

+# Can ignore specific files
+.DS_Store
+
+# Use wildcards as well
+*~
+*.mat
+*.pyc
+*.prn
+*.aux
+*.log
+*.dvi
+*.maf
+*.mtc
+*.mtc0
+*.synctex.gz
+*.dat
+*.eps
+*.ps
+*.pdf
+*.npy
+*.o
+
+# Can also ignore all directories and files in a directory.
+# tmp/**/*