chore: add .gitattributes to normalize line endings to LF (#5)

Without an explicit policy, Windows contributors see
"LF will be replaced by CRLF the next time Git touches it" warnings
on every commit. Force LF everywhere (working tree + repo) and mark
common binary asset types so git never tries to diff or normalize them.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: matthttam

.gitattributes

@@ -0,0 +1,20 @@
+# Treat all files as text by default and normalize line endings to LF
+# in both the repository and the working tree. This stops Windows
+# contributors from seeing the "LF will be replaced by CRLF" warning
+# when staging files written with CRLF by an editor.
+* text=auto eol=lf
+
+# Mark common binary asset types so git never tries to diff/normalize them.
+*.png  binary
+*.jpg  binary
+*.jpeg binary
+*.gif  binary
+*.webp binary
+*.ico  binary
+*.woff  binary
+*.woff2 binary
+*.ttf  binary
+*.eot  binary
+*.otf  binary
+*.zip  binary
+*.pdf  binary