colordiff: add page

pages/common/colordiff.md

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+# colordiff
+
+> A tool to colorize diff diff output.
+> The Perl script colordiff is a wrapper for `diff` and produces the same output but with pretty 'syntax' highlighting. Colour schemes can be customized..
+> More information: <https://github.com/kimmel/colordiff>.
+
+- Compare files:
+
+`colordiff {{file-1}} {{file-2}}`
+
+- Compare files, output in two columns:
+
+`colordiff -y {{file-1}} {{file-2}}`
+
+- Compare files, Ignore case differences in file contents:
+
+`colordiff -i {{file-1}} {{file-2}}`
+
+- Compare files,  Report when two files are the same:
+
+`colordiff -s {{file-1}} {{file-2}}`
+
+- Compare files, ignoring white spaces:
+
+`colordiff -w {{old_file}} {{new_file}}`