adds base16 ocean dark theme

data/themes.yml

@@ -4,6 +4,7 @@
 - { colors: '#F2F0EC,#E8E6DF,#F2777A,#FFFFFF,#515151,#515151,#99CC99,#66CCCC', name: 'Base16 Eighties Light' }
 - { colors: '#393939,#2D2D2D,#F2777A,#FFFFFF,#515151,#D3D0C8,#99CC99,#66CCCC', name: 'Base16 Eighties Dark' }
 - { colors: '#191A1C,#282A2E,#B6BC68,#FFFFFF,#363B41,#959896,#80A2BE,#C26161', name: 'Base16 Tomorrow Night' }
+- { colors: '#2b303b,#16181f,#4f5b66,#c0c5ce,#343d46,#a7adba,#a3be8c,#bf616a', name: 'Base16 Ocean Dark' }
 - { colors: '#754242,#BD3737,#9C4444,#FFFFFF,#434745,#FFFFFF,#99D04A,#DB6668', name: 'Big Red' }
 - { colors: '#0E3386,#133a94,#D12325,#FFFFFF,#a31a1c,#FFFFFF,#D12325,#D12325', name: 'Chicago Cubs' }
 - { colors: '#507800,#94AF63,#FFEA00,#507800,#94AF63,#FFFFFF,#F7FF00,#FF9900', name: 'Citrus' }