SV305 driver documentation added (#449)

indi-sv305/doc/sv305-doc.md

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+
+# SVBONY Astronomy cameras
+
+## Installation
+
+The INDI SV305 driver supports the SVBONY SV305 and SV305 PRO cameras on Intel (x86, amd64) and ARM (armv6, armv7 and armv8) Linux.  
+The SV105 and SV205 are UVC devices, please look at this page https://www.indilib.org/ccds/web-cameras.html  
+The SV305M PRO support is in progress.  
+
+In order to install the driver on Debian based distributions, use:  
+
+> sudo add-apt-repository ppa:mutlaqja/ppa  
+> sudo apt-get update  
+> sudo apt-get install libsv305 indi-sv305  
+
+## Features
+
+The driver supports single framing and streaming.  
+
+### Supported features:
+
+- ST4 guiding on SV305 PRO
+- ROI (software)
+- Binning (software)
+- Slow, medium and fast framing
+- RAW8 and RAW12 frame format
+- Dynamic stretching in RAW12 mode
+- Color bayer pattern
+
+### Known issues (mostly firmware related):
+
+- Exposures can't be aborted
+- Intensive configuration changes could lead to a crash
+- Some shifts in frame order had been reported (frame N-1 uploaded instead of frame N)
+- SV305M PRO should work, but not tested yet
+
+### Work in progress:
+
+- Full SV305M PRO support
+- MacOS X support
+
+## Operation
+
+### Connecting to SV305 cameras
+
+Simply connect the camera via USB to your PC or SBC (Single board computer).  
+The camera can be connected to an external powered hub as well.  
+You can connect multiple cameras.  
+
+### Main Control
+
+![Main Control panel](./control_panel.jpg)
+
+The controls tab provides settings to adjust common camera parameters such as gain, gamma, contrast..etc.  
+
+You may choose between RAW 12 bits depth or RAW 8 bits depth frame format.  
+
+For planetary imaging or fast streaming, use the ***Fast*** framerate. For long exposure, use ***Normal*** or ***Slow***.  
+
+RAW 12 bits depth frames are stored as 16 bits FITS files.  
+By default, the driver use the 12 least significant bits,  
+resulting in very dark images. You can then choose a *stretch* factor.  
+
+### General Info
+
+![General Info panel](./info_panel.jpg)
+
+This provides general information about the currently running driver and driver version.  
+It also lets you set the Observer and Object Information for the FITS Header.  
+
+### Miscellaneous
+
+The other panels are common to all CCDs drivers.  
+
+## Details
+
+Website :		https://www.svbony.com/  
+Tags :			CCD, camera, SVBONY  
+Driver name :		SV305  
+Driver executable :	indi_sv305_ccd  
+Family :		CCDs  
+Manufacturer :		SVBONY  
+Platforms :		Linux (Intel, ARM)  
+Author :		Blaise-Florentin Collin  
+Version :		1.2.4  
+
+![SV305 camera](./SV305.jpg)
+
+![SV305 PRO camera](./SV305PRO.jpg)