Add macOS theme (#166)

data/themes.yml

@@ -208,3 +208,4 @@
 - { colors: '#306998,#FFD43B,#FFD43B,#7F7F7F,#5A9FD4,#F4F4F4,#FFE873,#FFD43B', name: 'Python'}
 - { colors: '#2B1F32,#FFB86C,#E15D97,#FFFFFF,#4A1386,#FFFFFF,#35BA66,#0AACC5', name: 'Wild Cherry'}
 - { colors: '#389196,#C3C0AB,#9FCC3B,#008CB5,#C3C0AB,#FFFFFF,#D90F21,#D90f21', name: 'EMBL'}
+- { colors: '#F1F3F5,#DAD8DA,#D3DFE3,#303030,#C2E2ED,#303030,#1682FB,#34C749', name: 'macOs' }