Created External Modules (markdown)

External-Modules.md

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+Material Deck currently supports a few External Foundry modules.<br>
+Some of these are integrated within the various actions, while others can be found in the 'External Modules' action.
+
+# Integrated Modules
+* [The Furnace (advanced macros only)](https://github.com/CDeenen/MaterialDeck/wiki/Macro-Action#furnace-arguments)
+* [Custom Hotbar](https://github.com/CDeenen/MaterialDeck/wiki/Macro-Action#mode-hotbarvisible-hotbarcustom-hotbar)
+
+# External Modules Action
+Using the External Modules Action, you can control and display aspects of some modules.<br>
+
+## Fx Master
+[Fx Master](https://foundryvtt.com/packages/fxmaster/) allows you to create weather and filter overlays.
+
+### Type
+* Weather Controls - Control Fx Master weather controls
+* Colorize Effects - Draw a colored overlay
+* Filters - Overlay a filter
+
+## GM Screen
+[GM Screen](https://foundryvtt.com/packages/gm-screen/) is a module that allows you to create a GM Screen. By assigning this function to a button, you can open and close the GM screen with that button.