add ghostty config and theme

configs/ghostty_g/themes/Retro

@@ -0,0 +1,21 @@
+palette = 0=#13a10e
+palette = 1=#13a10e
+palette = 2=#13a10e
+palette = 3=#13a10e
+palette = 4=#13a10e
+palette = 5=#13a10e
+palette = 6=#13a10e
+palette = 7=#13a10e
+palette = 8=#16ba10
+palette = 9=#16ba10
+palette = 10=#16ba10
+palette = 11=#16ba10
+palette = 12=#16ba10
+palette = 13=#16ba10
+palette = 14=#16ba10
+palette = 15=#16ba10
+background = 000000
+foreground = 13a10e
+cursor-color = 13a10e
+selection-background = ffffff
+selection-foreground = 000000