refactor: break up cli pkg into nice small chunks

cli/server/add.go

@@ -0,0 +1,28 @@
+package server
+
+import (
+	"fmt"
+
+	"coopcloud.tech/abra/client"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli/v2"
+)
+
+var serverAddCommand = &cli.Command{
+	Name:        "add",
+	Usage:       "Add a new 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
+	},
+}