initialize backend project

Signed-off-by: Tobias Erbshäußer <tobias@tesoft.dev>

backend/api.go

@@ -0,0 +1,15 @@
+package main
+
+import "net/http"
+
+type ApiHandler struct {
+}
+
+func NewApiHandler() *ApiHandler {
+	// TODO
+	return &ApiHandler{}
+}
+
+func (api *ApiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// TODO
+}