Adding mkdir cheat

cheatsheets/mkdir

@@ -0,0 +1,9 @@
+# Create a directory and all its parents
+mkdir -p foo/bar/baz
+
+# Create foo/bar and foo/baz directories
+mkdir -p foo/{bar,baz}
+
+# Create the foo/bar, foo/baz, foo/baz/zip and foo/baz/zap directories
+mkdir -p foo/{bar,baz/{zip,zap}}
+