Update README.md

README.md

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 # vim-colorscheme_forest-refuge
 Additional Colorscheme for the texteditor vim (on debian)
+
+## Install colorsheme
+
+1. Download *.vim file:
+
+2. Copy *.vim into $VIMRUNTIME/colors
+
+   *inside VIM* 
+   `:echo $VIMRUNTIME`
+
+
+3. activate colorscheme inside vim:
+
+`:colorscheme forest_refuge`
+
+4. Add the colorscheme for auto-activation into $VIM/vimrc 
+
+`colorcheme forest_refuge`