Added wal colorscheme file.

wal/colorschemes/dark/obsidianblk

+{
+  "special":{
+    "background":"#2f3e46",
+    "foreground":"#cad2c5",
+    "cursor":"#737871"
+  },
+  "colors":{
+    "color0":"#2f3e46",
+    "color1":"#795252",
+    "color2":"#52796f",
+    "color3":"#767952",
+    "color4":"#526879",
+    "color5":"#675279",
+    "color6":"#5e8d87",
+    "color7":"#737871",
+    "color8":"#354f52",
+    "color9":"#a98484",
+    "color10":"#84a98c",
+    "color11":"#a9a384",
+    "color12":"#849ba9",
+    "color13":"#9d84a9",
+    "color14":"#8abeb7",
+    "color15":"#cad2c5"
+  }
+}