feat(Hashing): added more hash checking for repeat download checks to avoid overlap

README.md

@@ -235,6 +235,15 @@ The following options apply only to the `download` command. This command downloa
 - `--no-dupes`
     - This flag will not redownload files if they were already downloaded in the current run
     - This is calculated by MD5 hash
+- `--simple-check`
+    - **Enhanced: Works with Persistent Hash Storage**
+    - Enables fast URL-based duplicate detection for the `--no-dupes` functionality
+    - When enabled, the downloader first checks if a submission URL has been downloaded before calculating expensive file hashes
+    - Creates enhanced hash files (`.bdfr_hashes.json`) with URL mappings for faster subsequent runs
+    - Stores both hash-to-file and URL-to-hash mappings for optimal performance
+    - Falls back to full hash checking if URL is not found in the hash file
+    - Maintains backward compatibility with existing hash files
+    - Significantly improves performance when downloading from sources with many duplicate URLs
 - `--search-existing`
     - This will make the BDFR compile the hashes for every file in `directory`
     - The hashes are used to remove duplicates if `--no-dupes` is supplied or make hard links if `--make-hard-links` is supplied