Add cc65 artifacts to repo for now

cc65/asminc/atari7800_maria.inc

@@ -0,0 +1,39 @@
+; Atari 7800 MARIA read / write registers
+;
+
+; Read registers
+BKGRND := $20
+P0C1   := $21
+P0C2   := $22
+P0C3   := $23
+MWSYNC := $24
+P1C1   := $25
+P1C2   := $26
+P1C3   := $27
+MSTAT  := $28
+P2C1   := $29
+P2C2   := $2A
+P2C3   := $2B
+DPPH   := $2C
+P3C1   := $2D
+P3C2   := $2E
+P3C3   := $2F
+DPPL   := $30
+P4C1   := $31
+P4C2   := $32
+P4C3   := $33
+CHBASE := $34
+P5C1   := $35
+P5C2   := $36
+P5C3   := $37
+OFFSET := $38
+P6C1   := $39
+P6C2   := $3A
+P6C3   := $3B
+CTRL   := $3C
+P7C1   := $3D
+P7C2   := $3E
+P7C3   := $3F
+
+; Write registers
+