add documentation for indi_gige_ccd driver

src/content/docs/cameras/generic/aravis/aravis.md

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+---
+title: GigE-Vision and USB3-Vision Cameras
+categories: ["Cameras"]
+description: All Aravis-supported cameras
+thumbnail: ./aravis.webp
+---
+Using the open source [Project Aravis](https://github.com/AravisProject/aravis)
+GenICam library, INDI gains access to a large set of industrial machine-vision
+cameras.  Machine-vision cameras supported by Aravis implement the GenICam
+(Generic Interface for Cameras) standard and commonly conform to the GigE-Vision
+and USB3-Vision standards.
+
+GenICam (Generic Interface for Cameras) is a global machine vision standard that
+decouples camera hardware interfaces (like GigE Vision or USB3 Vision) from
+software applications. It provides a universal programming interface (API) so
+that any compliant camera can be controlled by any software without needing
+custom, manufacturer-specific drivers.
+
+From the Aravis documentation,
+> Aravis is a GLib/GObject based library for video acquisition using Genicam
+> cameras. It currently implements the gigabit ethernet and USB3 protocols used
+> by industrial cameras. It also provides a basic ethernet camera simulator and
+> a simple video viewer.
+
+## Features
+
+The driver supports both single-exposure image acquisition as well as image
+streaming.  The driver constructs a minimal set of controls provided and
+accessed by the underlying
+[Project Aravis](https://github.com/AravisProject/aravis) library.  Currently,
+controls for exposure, gain, subframing, and binning are supported.  At least
+some GenICam devices support the `DeviceTemperature` property.  If a particular
+camera includes the `DeviceTemperature` property, this is queried and inserted
+into fits images.  One should note that most GigE-Vision cameras do not provide
+control of the temperature.
+
+Currently, this driver expects the camera to already have its PixelFormat
+property to be set to Mono16.  Changing the PixelFormat and other properties
+must currently be done with Aravis tools directly while this INDI driver is
+**NOT** connected to the camera.  Further, while the INDI driver expects to
+connect to the camera, the Aravis tools must be disconnected.  Very easy
+modifification of some camera features (including PixelFormat) can be
+accomplished and tested with the arv-viewer-0.8 graphical interface.  Somewhat easy
+modification to all the other features of the camera can be done with the
+arv-tool-0.8 command.  Additionally, one can use
+[Python](https://lazka.github.io/pgi-docs/Aravis-0.8/index.html) or other Aravis
+[GLib/GObject-supported](https://aravisproject.github.io/aravis/aravis-stable/)
+programming interfaces to interact with and control these cameras.
+
+## Supported Cameras
+
+Any GigE-Vision or USB3-Vision GenICam camera may be supported.  [Project
+Aravis](https://github.com/AravisProject/aravis) does keep a [list of cameras
+known to work](https://github.com/AravisProject/aravis/wiki/TestedCameras),
+though this appears to be somewhat out of date.  Some cameras
+tested with INDI and not documented on the list include [FLIR's Oryx
+10GigE](https://www.teledynevisionsolutions.com/products/oryx-10gige), and
+several other FLIR cameras (both GigE-Vision and USB3-Vision types).
+
+### Connecting to Camera
+
+Only cameras that are accessible when the INDI server launches will be available
+for connecting.

src/content/docs/cameras/generic/aravis/aravis.yaml

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+# Display Names (Human-Friendly)
+driver_name: GigE CCD
+manufacturer_name: Generic
+
+# Categories (Required - can be multiple)
+categories:
+  - Cameras
+
+# Additional Metadata
+website: https://github.com/aravisproject/aravis
+platforms: Linux, OSX
+executable: indi_gige_ccd
+version: 0.2