First .gitignore for Stata files

Stata.gitignore

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+# .gitignore file for git projects containing Stata files
+# Commercial statistical software: http://www.stata.com
+
+# Stata dataset and output files
+*.dta
+*.gph
+*.log
+*.smcl
+*.stpr
+*.stsem
+
+# Graphic export files from Stata
+*.ps
+*.eps
+*.wmf
+*.emf
+*.pdf
+*.png
+*.tif