20210425

1. download fscmp.exe from release page
2. open cmd.exe and cd to where the binary locates
3. run fscmp.exe --snapshot [TARGET_DIR] [SNAPSHOT_1] to make a snapshot of [TARGET_DIR] and save as [SNAPSHOT_1]
4. do something to the folder (e.g., add some files or modify its content)
5. run fscmp.exe --snapshot [TARGET_DIR] [SNAPSHOT_2] to make a snapshot of [TARGET_DIR] again and save as [SNAPSHOT_2]
6. run fscmp.exe --diff [SNAPSHOT_1] [SNAPSHOT_2] to see the diff carried by step 4