Add README for hanami plugin

plugins/hanami/README.md

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+# Hanami Plugin #
+This plugin adds convinient ways to work with [Hanami](http://hanamirb.org/) via console. It's inspired by Rails plugin, so if you've used it, you'll be like home.
+
+## Usage ##
+For example, type `hc` into your console when you're within Hanami project directory to run application console.
+You can read about available commands [here](http://hanamirb.org/guides/command-line/applications/), almost all of them have shortcut aliases with this plugin.