add directory documentation

modules/directory/README.md

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+Directory
+=========
+
+Sets directory, navigation, and redirect options.
+
+ZSH options
+-----------
+
+| Option | Effect |
+| ------ | ----------- |
+| AUTO_CD | If the typed command is invalid, but is a directory, cd to that directory |
+| AUTO_PUSHD | After cd, push the old directory to the directory stack |
+| PUSHD_IGNORE_DUPS | Don't push multiple copies of the same directory to the stack |
+| PUSHD_SILENT | Don't print the directory after pushd or popd |
+| PUSHD_TO_HOME | pushd without arguments acts like 'pushd ${HOME}' |
+| EXTENDED_GLOB | Treat '#', '~', and '^' as patterns for filename globbing |
+| MULTIOS | Performs implicit tees or cats when using redirections |
+| CLOBBER | Disables automatic truncation with '>' or '>\|'. Use '>>!' or '>>\|' instead |