fortune: add page

pages/common/fortune.md

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+# fortune
+
+> Print a random quotation (fortune-cookie style)
+
+- Print a quotation
+
+`fortune`
+
+- Print a quotation from a given database
+
+`fortune {{database}}`
+
+- Print a list of quotation databases
+
+`fortune -f`
+
+- Print an offensive quotation
+
+`fortune -o`
+
+- Print a long quotation
+
+`fortune -l`
+
+- Print a short quotation
+
+`fortune -s`