[Sriram] update gitattributes

Author: nsriram

.gitattributes

@@ -4,3 +4,5 @@ samples/**/*.js linguist-detectable=true
 samples/**/*.js linguist-documentation=false
 samples/**/*.json linguist-detectable=true
 samples/**/*.json linguist-documentation=false
+samples/**/*.tf linguist-detectable=true
+samples/**/*.sh linguist-detectable=true