Merge branch 'lizhuoli1126-add_aria2c'

pages/common/aria2c.md

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+# aria2c
+
+> Fast download utility.
+> Supports HTTP(S), FTP, SFTP, BitTorrent, and Metalink.
+
+- Download a URI to a file:
+
+`aria2c {{url}}`
+
+- Download from multiple sources:
+
+`aria2c {{url_1}} {{url_2}}`
+
+- Download the URIs listed in a file:
+
+`aria2c -i {{filename}}`
+
+- Download with multiple connections:
+
+`aria2c -s {{connections_num}} {{url}}`
+
+- FTP download with username and password:
+
+`aria2c --ftp-user={{username}} --ftp-passwd={{password}} {{url}}`