Add tutorial for creating layers in frontend

doc/guidelines/frontend-create-layer-tutorial.md

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+# Creating a New Layer in Frontend
+
+This document gives guidelines on how to implement a new layer in the frontend.
+
+## Folder Structure
+
+- Navigate to the `layers` directory in your project (`features/map_planning/layers`).
+- Create a new folder named after the type of layer you want to add (e.g., "NewLayer").
+
+## Add Necessary Files and Folders
+
+- Inside the "NewLayer" folder:
+  - If your layer requires API interactions, create an `api` folder and place your .ts files in there or place them into the map_planning api folder depending on wheter its a special api that is part of the layer or its just for initiating the layer in general.
+  - For React components or custom hooks specific to this layer, add a `components` or `hooks` folder.
+  - Create a main TypeScript file for the layer (e.g., `NewLayer.tsx`).
+
+## Define the Layer Component
+
+- In `NewLayer.tsx`:
+  - Import Konva and other dependencies.
+  - Define a functional component that returns a Konva `Layer`.
+- In `mapEditorHookApi.ts`:
+  - Define a hook for your layer (e.g., `useNewLayer.tsx`).
+  - Add states that need be saved across components.
+  - Add init function (e.g., `initNewLayer`) which is then defined inside the `TrackedMapStore.ts`.
+
+## Implement Layer Logic
+
+- Use hooks (starting with `use` in the name) and the global MapStore (tracked & untracked) to manage state and interactions.
+  - **Tracked** is used for storing changes that can be rolled back with undo/redo.
+  - **Untracked** containes all other states that are not affected by this.
+- Ensure proper interaction with other layers and elements.
+
+## Test Your Layer
+
+- Write tests for hooks if feasable/useful (see plant/hooks) to verify functionality.
+  - Especially if side effects or wrong behaviour can not be easily seen in manual tests!