feat: server add command

Interacts with and stores infomaton in the docker store at ~/.docker

Equivalent to docker context add

cli/server.go

@@ -58,6 +58,18 @@ var serverAddCommand = &cli.Command{
 	Usage:       "Add a server, reachable on <host>.",
 	ArgsUsage:   "<host> [<user>] [<port>]",
 	Description: "[<user>], [<port>]    SSH connection details",
+	Action: func(c *cli.Context) error {
+		arg_len := c.Args().Len()
+		args := c.Args().Slice()
+		if arg_len < 3 {
+			args = append(args, make([]string, 3-arg_len)...)
+		}
+		if err := client.CreateContext(args[0], args[1], args[2]); err != nil {
+			logrus.Fatal(err)
+		}
+		fmt.Println(args[0])
+		return nil
+	},
 }
 
 var serverNewCommand = &cli.Command{