exa: add page

pages/common/exa.md

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+# exa
+
+> A modern replacement for ls (List directory contents).
+
+- List files one per line:
+
+`exa --oneline`
+
+- List all files, including hidden files:
+
+`exa --all`
+
+- Long format list (permissions, ownership, size and modification date) of all files:
+
+`exa --long --all`
+
+- List of files, with the largest at the top:
+
+`exa --reverse --sort=size`
+
+- Display a tree of files, three levels deep:
+
+`exa --long --tree --level=3`
+
+- List of files, sorted by modification date (oldest first):
+
+`exa --long --sort=modified`