add some macros and license

LICENSE

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+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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math/add

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+[0] [1] ADD

math/sub

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+[0] [1] SUB

screen/draw-pixel

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+[0] [1] .Screen/x DEO2 .Screen/y DEO2
+[2] .Screen/pixel DEO

system/color

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+[0] .System/r DEO2
+[1] .System/g DEO2
+[2] .System/b DEO2