style: New Theme Added - Spotify

Signed-off-by: k-kumar-01 <kushalkumargupta4@gmail.com>

ui/src/themes/index.js

@@ -1,4 +1,5 @@
 import LightTheme from './light'
 import DarkTheme from './dark'
+import SpotifyTheme from './spotify'
 
-export default { LightTheme, DarkTheme }
+export default { LightTheme, DarkTheme, SpotifyTheme }

ui/src/themes/spotify.js

@@ -0,0 +1,26 @@
+import green from '@material-ui/core/colors/green'
+
+export default {
+  themeName: 'Spotify',
+  palette: {
+    primary: {
+      light: green['300'],
+      main: green['500'],
+    },
+    secondary: {
+      main: green['900'],
+      contrastText: '#fff',
+    },
+    type: 'dark',
+  },
+  overrides: {
+    MuiFormGroup: {
+      root: {
+        color: 'white',
+      },
+    },
+  },
+  player: {
+    theme: 'dark',
+  },
+}