Add readme

Signed-off-by: Michael Brown <producer@holotronic.dk>

Author: the-snowwhite

HW/QuartusProjects/DE10_Nano_SoC_FB_DB25/README.md

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+This project is a clone of the DE0_Nano_SoC_DB25 project only with an added framebuffer driving the HDMI output.
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+The current screen resolution is: 1024x768x8bpp @60Hz.
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+The frame reader runs on a separate bus (f2h_sdram) as bus master, making it noticably faster than a cpu alone fb.
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+This project uses the hm2 config files from the DE0_Nano_SoC_DB25 project folder, so it will run with the same hm2 soc configs.