Added dark medium color scheme variant.

gruvbox-material-dark-medium.conf

@@ -0,0 +1,44 @@
+background #282828
+foreground #dfbf8e
+
+selection_background #dfbf8e
+selection_foreground #282828
+
+active_tab_background   #282828
+active_tab_foreground   #dfbf8e
+active_tab_font_style   bold-italic
+inactive_tab_background #282828
+inactive_tab_foreground #a89984
+inactive_tab_font_style normal
+
+# Black
+color0 #665c54
+color8 #928374
+
+# Red
+color1 #ea6962
+color9 #ea6962
+
+# Green
+color2  #a9b665
+color10 #a9b665
+
+# Yellow
+color3  #e78a4e
+color11 #e3a84e
+
+# Blue
+color4  #7daea3
+color12 #7daea3
+
+# Magenta
+color5  #d3869b
+color13 #d3869b
+
+# Cyan
+color6  #89b482
+color14 #89b482
+
+# White
+color7  #dfbf8e
+color15 #dfbf8e