add tokyonight theme (#215)

lua/highlights.lua

@@ -46,6 +46,7 @@ fg("Comment", grey_fg)
 fg("NvimInternalError", red)
 fg("VertSplit", line)
 fg("EndOfBuffer", black)
+--fg_bg("Visual",light_grey, colors.lightbg)
 
 -- Pmenu
 bg("Pmenu", one_bg)

lua/themes/tokyonight.lua

@@ -0,0 +1,33 @@
+local colors = {
+    white = "#c0caf5",
+    darker_black = "#151621",
+    black = "#171823", --  nvim bg
+    black2 = "#20212c",
+    one_bg = "#242530",
+    one_bg2 = "#292a35",
+    one_bg3 = "#353b45",
+    grey = "#40486a",
+    grey_fg = "#4a5274",
+    grey_fg2 = "#4f5779",
+    light_grey = "#545c7e",
+    red = "#f7768e",
+    baby_pink = "#DE8C92",
+    pink = "#ff75a0",
+    line = "#242530", -- for lines like vertsplit
+    green = "#9ece6a",
+    vibrant_green = "#73daca",
+    nord_blue = "#80a8fd",
+    blue = "#7aa2f7",
+    yellow = "#e7c787",
+    sun = "#EBCB8B",
+    purple = "#bb9af7",
+    dark_purple = "#9d7cd8",
+    teal = "#0db9d7",
+    orange = "#ff9e64",
+    cyan = "#7dcfff",
+    statusline_bg = "#1d1e29",
+    lightbg = "#252631",
+    lightbg2 = "#22232e"
+}
+
+return colors