created WebhookHandler func

assignment2/webhook.go

 package assignment2
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+var webhooks []WebhookRegistration //Webhook DB
+
+func WebhookHandeler(w http.ResponseWriter, r *http.Request) {
+
+	switch r.Method {
+	case http.MethodPost:
+		webhook := WebhookRegistration{}
+		err := json.NewDecoder(r.Body).Decode(&webhook)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		}
+
+		webhooks = append(webhooks, webhook)
+
+		fmt.Fprintln(w, len(webhooks)-1)
+		fmt.Println("Webhooks " + webhook.URL + " has been regstrerd")
+
+	case http.MethodGet:
+		err := json.NewEncoder(w).Encode(webhooks)
+		if err != nil {
+			http.Error(w, "Some thing went wrong"+err.Error(), http.StatusInternalServerError)
+		}
+
+	default:
+		http.Error(w, "Method is invalid "+r.Method, http.StatusBadRequest)
+	}
+
+}