add gitignore

.gitignore

@@ -0,0 +1,12 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
+*.pdf
+*.aux
+*.fdb_latexmk
+*.log
+*.synctex.gz
+*.fls