added Jarmo Pretman's expand-aliases plugin

plugins/expand_aliases/README.md

@@ -0,0 +1,25 @@
+# expand-aliases
+
+**Maintainer:** [Jarmo Pertman](https://github.com/jarmo)
+
+This plugin expands aliases while typing them in terminal.
+
+For example:
+```zsh
+alias foo="bar baz"
+
+$ foo
+# pressing space will expand that alias to... surprise, surprise
+$ bar baz
+```
+
+To **skip** expansion, use `control-space` instead of just `space`.
+
+## Installation
+
+Just add it to `oh-my-zsh` plugins list in `~/.zshrc`, but make sure it is added last (or not
+last if you prefer some aliases not to be expanded).
+
+`
+plugins=(... expand-aliases)
+`