autojump: add page

pages/common/autojump.md

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+# autojump
+
+> Automatically jump to the directory you visited the most. Aliases like j or jc can also be used for fewer typing.
+
+- Jump to a directory that contains the given pattern.
+
+`j {{pattern}}`
+
+- Jump to a sub-directory of current directory that contains the given pattern.
+
+`jc {{pattern}}`
+
+- Remove non-existing directories from the autojump database.
+
+`j --purge`
+
+- Show entries in the autojump database.
+
+`j -s`