Create .gitattributes

Show Smalltalk as project language

Author: bouraqadi

.gitattributes

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+# Bash needs lf even on windows/cygwin
+*.st eol=lf
+*.sh eol=lf
+
+# st files are always text, even if they contain invalid encoded chars
+*.st text diff
+
+# GitHub is unable to properly detect Smalltalk code, so help it a bit
+*.st linguist-language=Smalltalk