🎨 Adds colorscheme screenshots to new file

Currently, there are some screenshots of available
colorschemes at the beginning of the README. These
changes add a new `.md` file linked to from the
README with a comprehensive set of screenshots,
linked from the project Wiki using relative paths.

colorscheme.md

@@ -0,0 +1,109 @@
+# Available Colorschemes
+
+### 16color
+
+![lightline.vim - 16color](../../wiki/image/16color.png)
+
+### OldHope
+
+![lightline.vim - OldHope](../../wiki/image/OldHope.png)
+
+### PaperColor dark
+
+![lightline.vim - PaperColor dark](../../wiki/image/PaperColor_dark.png)
+
+### PaperColor light
+
+![lightline.vim - PaperColor light](../../wiki/image/PaperColor.png)
+
+### Tomorrow
+
+![lightline.vim - Tomorrow](../../wiki/image/Tomorrow.png)
+
+### Tomorrow Night
+
+![lightline.vim - Tomorrow Night](../../wiki/image/Tomorrow_Night.png)
+
+### Tomorrow Night Blue
+
+![lightline.vim - Tomorrow Night Blue](../../wiki/image/Tomorrow_Night_Blue.png)
+
+### Tomorrow Night Bright
+
+![lightline.vim - Tomorrow Night Bright](../../wiki/image/Tomorrow_Night_Bright.png)
+
+### Tomorrow Night Eighties
+
+![lightline.vim - Tomorrow Night Eighties](../../wiki/image/Tomorrow_Night_Eighties.png)
+
+### ayu_mirage
+
+![lightline.vim - ayu mirage](../../wiki/image/ayu_mirage.png)
+
+### darcula
+
+![lightline.vim - darcula](../../wiki/image/darcula.png)
+
+### deus
+
+![lightline.vim - deus](../../wiki/image/deus.png)
+
+### jellybeans
+
+![lightline.vim - jellybeans](../../wiki/image/jellybeans.png)
+
+### landscape
+
+![lightline.vim - landscape](../../wiki/image/landscape.png)
+
+### materia
+
+![lightline.vim - materia](../../wiki/image/materia.png)
+
+### material
+
+![lightline.vim - material](../../wiki/image/material.png)
+
+### molokai
+
+![lightline.vim - molokai](../../wiki/image/molokai.png)
+
+### nord
+
+![lightline.vim - nord](../../wiki/image/nord.png)
+
+### one
+
+![lightline.vim - one](../../wiki/image/one.png)
+
+### powerline (default)
+
+![lightline.vim - powerline](../../wiki/image/powerline.png)
+
+### powerlineish
+
+![lightline.vim - powerlineish](../../wiki/image/powerlineish.png)
+
+### selenized dark
+
+![lightline.vim - selenized dark](../../wiki/image/selenized_dark.png)
+
+### seoul256
+
+![lightline.vim - seoul256](../../wiki/image/seoul256.png)
+
+### simpleblack
+
+![lightline.vim - simpleblack](../../wiki/image/simpleblack.png)
+
+### solarized
+
+![lightline.vim - solarized](../../wiki/image/solarized.png)
+
+### srcery drk
+
+![lightline.vim - srcery drk](../../wiki/image/srcery_drk.png)
+
+### wombat
+
+![lightline.vim - wombat](../../wiki/image/wombat.png)