added powerline-dark theme

* added replace colorscheme

 * updated screenshots

 * added patched font screenshots

THEMES.md

@@ -239,6 +239,14 @@ them based you your `background` option.
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649158-18e16e00-74bd-11eb-8687-65b0ecbf20d2.png'/>
 </p>
 
+### powerline_dark
+<p>
+<img width='700' src='https://user-images.githubusercontent.com/59497618/131224416-851aedd4-27bb-47fd-a9a6-5332aa42ce60.png'/>
+<img width='700' src='https://user-images.githubusercontent.com/59497618/131224418-7bec491b-1183-4ec7-8089-3dbe460cc1e4.png'/>
+<img width='700' src='https://user-images.githubusercontent.com/59497618/131224419-adab4f88-aaf8-449e-9988-ae002333d131.png'/>
+<img width='700' src='https://user-images.githubusercontent.com/59497618/131224421-3b175d7a-fb14-424c-ad53-03d2c3b2ab71.png'/>
+</p>
+
 ### seoul256
 <p>
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649194-2c8cd480-74bd-11eb-8fbc-935d7e0fe921.png'/>

lua/lualine/themes/powerline_dark.lua

@@ -0,0 +1,56 @@
+-- Copyright (c) 2021 Ashish Panigrahi
+-- MIT license, see LICENSE for more details.
+-- LuaFormatter off
+local colors = {
+  black        = '#202020',
+  neon         = '#DFFF00',
+  white        = '#FFFFFF',
+  green        = '#00D700',
+  purple       = '#5F005F',
+  blue         = '#00DFFF',
+  darkblue     = '#00005F',
+  navyblue     = '#000080',
+  brightgreen  = '#9CFFD3',
+  gray         = '#444444',
+  darkgray     = '#3c3836',
+  lightgray    = '#504945',
+  inactivegray = '#7c6f64',
+  orange       = '#FFAF00',
+  red          = '#5F0000',
+  brightorange = '#C08A20',
+  brightred    = '#AF0000',
+  cyan         = '#00DFFF',
+}
+-- LuaFormatter on
+return {
+  normal = {
+    a = {bg = colors.neon, fg = colors.black, gui = 'bold'},
+    b = {bg = colors.gray, fg = colors.white},
+    c = {bg = colors.black, fg = colors.brightgreen}
+  },
+  insert = {
+    a = {bg = colors.blue, fg = colors.darkblue, gui = 'bold'},
+    b = {bg = colors.navyblue, fg = colors.white},
+    c = {bg = colors.purple, fg = colors.white}
+  },
+  visual = {
+    a = {bg = colors.orange, fg = colors.black, gui = 'bold'},
+    b = {bg = colors.darkgray, fg = colors.white},
+    c = {bg = colors.red, fg = colors.white}
+  },
+  replace = {
+    a = {bg = colors.brightred, fg = colors.white, gui = 'bold'},
+    b = {bg = colors.cyan, fg = colors.darkblue},
+    c = {bg = colors.navyblue, fg = colors.white}
+  },
+  command = {
+    a = {bg = colors.green, fg = colors.black, gui = 'bold'},
+    b = {bg = colors.darkgray, fg = colors.white},
+    c = {bg = colors.black, fg = colors.brightgreen}
+  },
+  inactive = {
+    a = {bg = colors.darkgray, fg = colors.gray, gui = 'bold'},
+    b = {bg = colors.darkgray, fg = colors.gray},
+    c = {bg = colors.darkgray, fg = colors.gray}
+  }
+}