Preliminary CoCo support

docs/api/coco-programming-guide.md

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+[< back to index](../doc_index.md)
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+### A note about Color Computer
+
+The `coco_rsdos` target creates binary files that can run on Tandy Color Computer running RS-DOS.
+
+The compiler output is a raw machine code file with the `.bin` extension, which then has to be put on a disk. 
+You can do it using `imgtool` from the [MAME project](https://www.mamedev.org/):
+
+    imgtool create coco_jvc_rsdos disk_image.dsk
+    imgtool put coco_jvc_rsdos disk_image.dsk compiler_output.bin CO.BIN
+
+The resulting file can then be loaded and ran using the following commands:
+
+    LOADM"CO":EXEC