feat(Default): add Ocean colorscheme and Default theme

Default/README.md

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+# Default
+
+Default look of Spotify with different color schemes.
+
+## Screenshot
+
+![screenshot](./ocean.png)
+
+## Info
+
+### Ocean
+
+Part of material ocean themes, [checkout here](https://github.com/material-ocean) for the same theme for different applications. By @Blacksuan19

Default/color.ini

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+[Ocean]
+text               = FFFFFF
+subtext            = F1F1F1
+main               = 0F111A
+sidebar            = 0F111A
+player             = 0F111A
+card               = 00010A
+shadow             = 0F111A
+selected-row       = F1F1F1
+button             = FF4151
+button-active      = F1F1F1
+button-disabled    = 434C5E
+tab-active         = FF4151
+notification       = 00010A
+notification-error = FF4151
+misc               = 00010A