aria2: add page (#2748)

pages/common/aria2.md

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+# aria2
+
+> A lightweight multi-protocol & multi-source command-line download utility.
+> Supports HTTP, HTTPS, FTP, SFTP, BitTorrent and Metalink.
+> Homepage: <https://aria2.github.io/>.
+
+- Download a web resource:
+
+`aria2c {{http://example.org/myLinux.iso}}`
+
+- Download a resource from multiple sources:
+
+`aria2c {{http://mirror1.org/myLinux.iso}} {{http://mirror2.org/myLinux.iso}}`
+
+- Download using 2 connections per host:
+
+`aria2c -x{{2}} {{http://example.org/myLinux.iso}}`
+
+- Download from a Metalink URI:
+
+`aria2c {{http://example.org/myLinux.metalink}}`
+
+- Download from a BitTorrent URI:
+
+`aria2c {{http://example.org/myLinux.torrent}}`
+
+- Download from a BitTorrent Magnet URI:
+
+`aria2c {{'magnet:?xt=urn:btih:248D0A1CD08284299DE78D5C1ED359BB46717D8C'}}`
+
+- Download URIs from a file:
+
+`aria2c -i {{uris.txt}}`