Add TODO file

TODO

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+- add possibility to configure file colors in .zshrc
+  a) no colors at all for all files
+  b) one defined colors for all files
+  c) the same color as path
+  d) use LS_COLORS
+
+- separate lsstyle for files and prefix_file?
+
+- describe in README
+  a) new STYLES (files, command prefix)
+  b) how to switch colors (theme) for files
+  c) how to change color for single file type (via ZSH_HIGHLIGHT_FILES table)