Added modules readme

modules/README.md

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+# Modules
+
+Modules are parts of this configuration that can be disabled. Nearly all features in this config are defined by a module.
+
+## Organization
+
+Every directory in `modules/` is a module. Modules cannot be in subdirectories. \
+Each module directory MUST have an ``init.lua``, which returns a table. That table can contain anything, but a few keys are special:
+
+``keybinds`` \
+Defines keybinds the module provides. It is audomatically loaded *if* the module is enabled. \
+This MUST be a table formed by ``awful.key()``. See `ibus` or `screenshot` for examples.
+
+``init`` \
+Defines an init method. This is called once when awesome starts.