Add .gitattributes for proper line endings and language detection

.gitattributes

@@ -0,0 +1,37 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Source code
+*.c text
+*.h text
+*.js text
+*.json text
+*.rs text
+
+# Documentation
+*.md text
+*.txt text
+
+# Configuration
+*.toml text
+*.gyp text
+
+# Scripts
+*.sh text eol=lf
+
+# Binary files
+*.node binary
+*.o binary
+*.a binary
+*.so binary
+*.dylib binary
+*.dll binary
+
+# Git
+.gitattributes text
+.gitignore text
+
+# Linguist overrides
+src/parser.c linguist-generated
+src/grammar.json linguist-generated
+src/node-types.json linguist-generated