Add new matte black theme by @tahayvr

themes/matte-black/mako.ini

@@ -0,0 +1,18 @@
+text-color=#8a8a8d
+background-color=#1e1e1e
+border-radius=10
+width=420
+height=110
+padding=10
+font=CaskaydiaMono Nerd Font
+border-size=0
+anchor=top-right
+default-timeout=3000
+max-icon-size=32
+
+[app-name=Spotify]
+invisible=1
+
+[urgency=high]
+background-color=#660d0d
+text-color=#ffffff