add the page of rdesktop command

pages/linux/rdesktop.md

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+# rdesktop
+
+> Remote Desktop Protocol client.
+> It can be used to connect the remote computer using the RDP protocol.
+
+- Connect to a remote computer (default port is 3389):
+
+`rdesktop -u {{username}} -p {{password}} {{host:port}}`
+
+- Simple Examples:
+
+`rdesktop -u Administrator -p passwd123 192.168.1.111:3389`
+
+- Connect to a remote computer with full screen (press `Ctrl+Alt+Enter` to exist):
+
+`rdesktop -u {{username}} -p {{password}} -f {{host:port}}`
+
+- Use the customed resolution (use the letter 'x' between the number):
+
+`rdesktop -u {{username}} -p {{password}} -g 1366x768 {{host:port}}`
+
+- Connect to a remote computer using domain user:
+
+`rdesktop -u {{username}} -p {{password}} -d {{domainname}} {{host:port}}`
+
+- Use the 16 bit color (speed up):
+
+`rdesktop -u {{username}} -p {{password}} -a 16 {{host:port}}`