Add html, handler and db mock

handler/mainpage.go

@@ -0,0 +1,13 @@
+package handler
+
+import (
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"trikotwaschliste/database"
+)
+
+func MainPage() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.HTML(http.StatusAccepted, "index.html", database.DbMainpage())
+	}
+}