feat: add rocks db

__database/rocksdb/src/main.rs

@@ -0,0 +1,16 @@
+use rocksdb::{DB, Options};
+
+fn main() {
+    let path = "_path_for_rocksdb_storage";
+    {
+        let db = DB::open_default(path).unwrap();
+        db.put(b"my key", b"my value").unwrap();
+        match db.get(b"my key") {
+            Ok(Some(value)) => println!("retrieved value {}", String::from_utf8(value).unwrap()),
+            Ok(None) => println!("value not found"),
+            Err(e) => println!("operational problem encountered: {}", e),
+        }
+        db.delete(b"my key").unwrap();
+    }
+    let _ = DB::destroy(&Options::default(), path);
+}