Add edit command to edit a zettel

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

internal/lib/run.go

@@ -0,0 +1,22 @@
+package lib
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+func Exec(args ...string) error {
+	path, err := exec.LookPath(args[0])
+
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	cmd := exec.Command(path, args[1:]...)
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+
+	return cmd.Run()
+}