Merge pull request doubtfire-lms#476 from b0ink/fix/ignore-test-files

qol: exclude test files from language stats

Large files such as the .ipynb jupyter notebooks that are only used for tests will no longer show up as the main language for the repository

Author: b0ink

.gitattributes

@@ -1,2 +1,5 @@
 # Set the default behavior, in case people don't have core.autocrlf set.
 * text=auto eol=lf
+
+# Exclude test files from GitHub language statistics
+test_files/** linguist-vendored