Porting onedark theme (#8)

* Porting onedark theme

* Fixed incorrect foreground background configuration for onedark theme. Also set command mode in onedark theme to be normal

* Adding onedark theme to available themes list in README

README.md

@@ -66,6 +66,7 @@ lualine.theme = 'gruvbox'
 
 * gruvbox
 * dracula
+* onedark
 
 Please create a pr if you managed to port a popular theme before me
 </details>

lua/lualine/themes/onedark.lua

@@ -0,0 +1,102 @@
+local M = {  }
+
+local Colors = {
+  red = "#E06C75",
+  dark_red = "#BE5046",
+  green = "#98C379",
+  yellow = "#E5C07B",
+  dark_yellow = "#D19A66",
+  blue = "#61AFEF",
+  purple = "#C678DD",
+  cyan = "#56B6C2",
+  white = "#ABB2BF",
+  black = "#282C34",
+  visual_black = "NONE",
+  comment_grey = "#5C6370",
+  gutter_fg_grey = "#4B5263",
+  cursor_grey = "#2C323C",
+  visual_grey = "#3E4452",
+  menu_grey = "#3E4452",
+  special_grey = "#3B4048",
+  vertsplit = "#181A1F",
+}
+
+M.normal = {
+  a = {
+    fg = Colors.black,
+    bg = Colors.green,
+  },
+  b = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+  c = {
+    fg = Colors.green,
+    bg = Colors.black,
+  },
+}
+
+M.insert = {
+  a = {
+    fg = Colors.black,
+    bg = Colors.blue,
+  },
+  b = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+  c = {
+    fg = Colors.blue,
+    bg = Colors.black,
+  },
+}
+
+M.visual = {
+  a = {
+    fg = Colors.black,
+    bg = Colors.purple,
+  },
+  b = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+  c = {
+    fg = Colors.purple,
+    bg = Colors.black,
+  },
+}
+
+M.replace = {
+  a = {
+    fg = Colors.black,
+    bg = Colors.red,
+  },
+  b = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+  c = {
+    fg = Colors.red,
+    bg = Colors.black,
+  },
+}
+
+M.terminal = M.normal
+M.command = M.normal
+
+M.inactive = {
+  a = {
+    fg = Colors.black,
+    bg = Colors.white,
+  },
+  b = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+  c = {
+    fg = Colors.white,
+    bg = Colors.visual_grey,
+  },
+}
+
+return M