feat: add simple continuation implementation

continuation.go

@@ -0,0 +1,24 @@
+package continuation
+
+type Continuation struct {
+    result interface{}
+    err    error
+    doneChan chan struct{}
+}
+
+func NewContinuation() *Continuation {
+    return &Continuation{
+        doneChan: make(chan struct{}),
+    }
+}
+
+func (c *Continuation) Resume(result interface{}, err error) {
+    c.result = result
+    c.err = err
+    close(c.doneChan)
+}
+
+func (c *Continuation) Wait() (interface{}, error) {
+    <-c.doneChan
+    return c.result, c.err
+}