Merge pull request #239 from rognan/master

Add cheat for ls-command

cheat/cheatsheets/ls

@@ -9,3 +9,9 @@ ls -lh
 
 # Display files, sorted by size
 ls -S
+
+# Display directories only
+ls -d */
+
+# Display directories only, include hidden
+ls -d .*/ */