Add README, .gitignore, and clean up build artifacts

- Added comprehensive README with usage instructions
- Added .gitignore to prevent build artifacts from being committed
- Removed target/ directories and duplicate WASM files
- Cleaned up parser binaries and test files

.gitignore

@@ -0,0 +1,25 @@
+# Build artifacts
+target/
+*.wasm
+*.dylib
+*.so
+*.dll
+*.dylib
+*.a
+*.o
+
+# Node modules
+node_modules/
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log