Initial addition of support for worktrees

pkg/commands/models/worktree.go

@@ -0,0 +1,21 @@
+package models
+
+// Worktree : A git worktree
+type Worktree struct {
+	Name    string
+	Main    bool
+	Current bool
+	Path    string
+}
+
+func (w *Worktree) RefName() string {
+	return w.Name
+}
+
+func (w *Worktree) ID() string {
+	return w.RefName()
+}
+
+func (w *Worktree) Description() string {
+	return w.RefName()
+}