Merge branch 'add_aria2c' of git://github.com/lizhuoli1126/tldr into 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(include Metalink) to a file
+
+`aria2c {{url}}`
+
+- Download from multiple sources
+
+`aria2c {{url_1}} {{url_2}}`
+
+- Download the URIs listed in a file (one line one URI)
+
+`aria2c -i {{filename}}`
+
+- Download with multiple connections
+
+`aria2c -s {{connections_num}} {{url}}`
+
+- Limit download speed
+
+`aria2c --max-download-limit {{200K}} {{url}}`
+
+- FTP download with username and password
+
+`aria2c --ftp-user={{username}} --ftp-passwd={{password}} {{url}}`