Add README (special thanks to Christopher Lozinski)

README.md

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+# Pico Ice Video
+
+This repository displays a video signal from the Pico Ice FPGA on the
+desktop computer, over USB, using the USB Video Device Class (UVC).
+You can then take screenshots, record the video, or use it as a demo
+during a Zoom call.
+
+Here is the [FPGA
+interface](https://git.shylie.info/shylie/pico-ice-video/src/branch/main/ice/mandelbrot/source/impl_1/top.sv). There
+is a start wire, really that is the vertical sync signal.  There are 8
+bits of data that get sent to the RP2040.  The RP2040 reads the data
+using PIO, writes the data to the inactive frame buffer using direct
+memory access.  Meanwhile the TinyUSB library is writing uncompressed
+data to the desktop over USB using the active frame buffer.  The
+RP2040 sysclk runs at120 MHz, the clkdiv for the pio is 2.5 and the
+FPGA runs at 48Mhz.  The image size is 320 * 180.  The next version of
+the Pico-Ice will have the RP2350 Chip which will also support a
+higher resolution HDMI output. 
+
+This software is based on the [Tiny video USB Capture example](
+https://github.com/hathach/tinyusb/tree/master/examples/device/video_capture).
+UVC does not need to be fully synchronous: there is no timing to
+keep-up with: if you send the frame sometimes slow sometimes fast, it
+is fine.  In particular if using BULK (throw data in like it's a
+truck) endpoint rather than ISOCHRONOUS (always same time
+interval...)
+
+## Contact
+
+If you have questions, first please search the Pico Ice discord
+server, and then ask.  This is a private repository, to make
+contributions, please post your branch somewhere and notify the author
+@shylie on the Pico Ice Discord server.
+
+## INSTALLATION
+
+To install it on linux , [put the Pico-Ice into install mode](
+https://pico-ice.tinyvision.ai/md_programming_the_mcu.html )
+
+Using the command
+
+picocom) --baud 1200 /dev/ttyACM0
+
+Then drag the executable onto the RP2040 drive on the desktop. 
+
+## TO DO
+
+**Implement compression**.  There are lower complexity compression
+  techniques,PEG-XS seems to be one of the newer standards thats meant
+  for low latency and reasonable compression. This may be doable with
+  the RPi in FW. Doubt MJPG is possible for larger frames as that
+  requires multiple frames to be in memory.
+
+**Free UP SPI and UART pins** The interface requires 9 pins.  There
+  are 8 RP2040<->FPGA pins, so one of the spi pins is also used. One
+  could solder a pin between the FPGA and RP2040 and preserve the SPI
+  bus.  Better yet, solder 3 pins and preserve both the SPI bus, and
+  the default part. 
+
+## Special Thanks
+
+Christopher Lozinski (@clozinski) - wrote this README file. Thank you!