lovebyte2023: update READMEs

demos/lovebyte2023/field_16/README

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+This is yet another tiny Apple II hires/shapetable intro.
+
+It loads at $E7 (HGR_SCALE) so that we set that value
+for free from the first instruction (in this case JSR so $20).
+
+I thought this result at times looked like a field of grain,
+hence the name.
+
+I found this one while doing a search of ROM values that were
+easy to load the address for, but the results looked nice.
+In this case the rotation and ROM address are $F6 and $F6F6
+which makes it easy to load them in a small amount of space.

demos/lovebyte2023/loveduck_512/README

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+512 byte bootsector demo for the Apple II
+
+I had more elaborate plans for this one, including having the duck 
+appear randomly over the screen. Ran out of time and also out of bytes.
+
+I also wanted a quacking noise, but couldn't figure out how to do that
+in the bytes available.
+
+This is an actual bootsector (well, Apple II has 256 byte disk sectors, 
+but the disk boot ROM will let you specify more than one to load). Apple 
+II loads the boot sector starting at $800, which is a problem for a 
+Lo-res demo as that's also the location of lo-res PAGE2 graphics. So I 
+had to waste a chunk of code to move the code out of the way before 
+running it.
+
+The spinning lo-res logo is actually using the hi-res shape table routines.
+How is that possible?  It draws a small rotating copy of the logo to
+the upper-left corner of the (not-displayed) hi-res screen. Then the code
+copies this (while adding more colors) to the lo-res screen.  It's hard
+to do this quickly, to save time and space it actually destroys the hi-res
+image by shifting it down to zero while reading it out,
+but this is actually good as then we don't have to clear the screen.

demos/lovebyte2023/weave_16/README

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+This is yet another tiny Apple II hires/shapetable intro.
+
+It loads at $E7 (HGR_SCALE) so that we set that value
+for free from the first instruction (in this case JSR so $20).
+
+I thought this looked like woven cloth at times, hence the name.
+
+I found this one while searching for pleasant looking patterns
+in the ROM to display that were easy to load.  Specifically patterns
+that have a 0 value after one or two bytes, as those are smaller shapes.
+In this case this is rotation value $E2 at address $E2E2 which is
+easy to load.
+