Add some usage text to help address #354

Author: scottchiefbaker

diff-so-fancy

@@ -671,9 +671,12 @@ sub usage {
 
 	$out .= "Usage:
 
-git diff --color | diff-so-fancy # Use d-s-f on one diff
-diff-so-fancy --colors           # View the commands to set the recommended colors
-diff-so-fancy --set-defaults     # Configure git-diff to use diff-so-fancy and suggested colors
+git diff --color | diff-so-fancy         # Use d-s-f on one diff
+cat diff.txt | diff-so-fancy             # Use d-s-f on a diff/patch file
+diff -u one.txt two.txt | diff-so-fancy  # Use d-s-f on unified diff output
+
+diff-so-fancy --colors                   # View the commands to set the recommended colors
+diff-so-fancy --set-defaults             # Configure git-diff to use diff-so-fancy and suggested colors
 
 # Configure git to use d-s-f for *all* diff operations
 git config --global core.pager \"diff-so-fancy | less --tabs=4 -RFX\"\n";