Update README.md

Added use case info.

Author: UFFR

README.md

@@ -1,4 +1,6 @@
 # FileSplitter
 A small Java program to split large files into several smaller ones, then put them back together. Creates a tiny file containing information to help merge the chunks and includes checksums to notify of corruption.
 
+Use case is primarily to split large files to send to others, such as through email or Discord, where the recipient can then reconsitute the file.
+
 Chunks can be any size >=1 KB. The `.sum` file is a binary file used to tell the merging part of the program. It contains the original size, the chunk sizes, number of chunks, and `SHA-256` checksums of the original file and every chunk. Any discrepancy between what it has saved and what is actually read and calculated is noted to the user.