docs: first pass at using docfx

docs/Standalone-Use.md

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+# Standalone application
+
+Essentials was originally designed as a standalone SIMPL# Pro control system application and has developed into a versatile, pluggable application. This page describes how to use our built-in room types for a completely self-contained "one-slot" control program.
+
+By defining devices and a room in a JSON configuration file, Essentials can control an entire AV control system for a room. A file can be manually created in an IDE such as Visual Studio Code, or it can be generated by a friendly web-based configuration tool on [PepperDash Portal](http://pepperdash.com/products/), or some other configuration tool application, both requiring no knowledge of JSON.  These tools step a user through building the necessary devices and setting to achieve a full working room.
+
+## Included standalone room types
+
+* `EssentialsHuddleSpaceRoom` - Presentation-only Huddle Room
+  * Single display device (multiples supported if all displaying mirrored content)
+  * Use the display's speakers or another device for audio
+  * Any number of presentation sources
+  * Fusion Room and Static Asset integration with device usage tracking and schedule awareness
+  * Occupancy Sensor integration with vacancy shutdown
+  * Audio/video routing via Crestron DM hardware
+
+* `EssentialsHuddleVtc1Room` - Single-display ATC/VTC capable Huddle Room
+  * All of the above, plus:
+  * Audio calling via a DSP/Audio Codec or Video Codec
+  * Video calling via a Video Codec
+  * Microphone Mute button and LED color control
+  * Schedule awareness via Video Codec
+  * One button meeting join for Video Calling (with supported Video Codec)
+
+See Also: [[Supported Devices|Supported-Devices]]
+
+Next: [Simpl Windows bridging](~/docs/SIMPL-Bridging-Updated.md)