Add pages for vim and vimtutor

pages/common/vim.md

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+# vim
+
+> Vi IMproved, a programmers text editor
+
+- open a file with cursor at the given line number
+
+`vim {{file}} +{{linenumber}}`
+
+- open multiple files at once, each file in it's own tab page
+
+`vim -p {{file1}} {{file2}} {{file3}}`
+
+- open a file in read-only mode
+
+`view {{file}}`
+
+- exiting vim
+
+`[Esc] (to switch to normal mode), then :q`

pages/common/vimtutor.md

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+# vimtutor
+
+> Vim tutor, teaching the basic vim commands
+
+- launch the vim tutor using the given language (en, fr, de, ...)
+
+`vimtutor {{language}}`
+
+- exiting the tutor
+
+`[Esc] (to switch to normal mode), then :q`