added frontend and updated backend with docker, wrote some initial instructions

backend/service/room/roomService.go

@@ -0,0 +1,13 @@
+package room
+
+import (
+	"github.com/labstack/echo/v5"
+	"github.com/pocketbase/pocketbase"
+	"htwk-planner/service/db"
+	"net/http"
+)
+
+func GetRooms(c echo.Context, app *pocketbase.PocketBase) error {
+	rooms := db.GetRooms(app)
+	return c.JSON(http.StatusOK, rooms)
+}