added gitignore

.gitignore

@@ -0,0 +1,22 @@
+# Generated build directory
+/target/
+
+# Cargo’s lock file (uncomment if you’re publishing a library; otherwise keep it committed)
+/Cargo.lock
+
+# If you use rustfmt’s override file
+/override.toml
+
+# If you use sccache for caching
+/.cache/sccache/
+
+# If you build with Cargo’s check --unit-graph (creates a unit-graph.json)
+/unit-graph.json
+
+# IDE/editor temporary files (optional)
+/**/*.rs.bk
+**/*.rs.orig
+**/*.rs.rej
+**/*~
+*.swp
+*.swo