Create the projects part.

app/Http/Controllers/Api/ProjectController.php

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+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Project;
+use Illuminate\Http\Request;
+use Illuminate\Http\JsonResponse;
+
+class ProjectController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index(): JsonResponse
+    {
+        return response()->json(Project::with(['customer'])->get());
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(Request $request): JsonResponse
+    {
+        $projectData = $request->validate([
+            'customer_id' => 'required|exists:customers,id',
+            'name' => 'required|string',
+            'project_number' => 'required|string',
+            'description' => 'nullable|string',
+            'start_date' => 'required|date',
+            'end_date' => 'required|date',
+        ]);
+
+        $project = new Project($projectData);
+        $project->save();
+
+        return response()->json($project);
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(Request $request, Project $project): JsonResponse
+    {
+        $projectData = $request->validate([
+            'customer_id' => 'required|exists:customers,id',
+            'name' => 'required|string',
+            'project_number' => 'required|string',
+            'description' => 'nullable|string',
+            'start_date' => 'required|date',
+            'end_date' => 'required|date',
+        ]);
+
+        $project->update($projectData);
+
+        return response()->json($project);
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Project $project)
+    {
+        //
+    }
+}

app/Http/Controllers/ProjectController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Project;
+use Illuminate\Contracts\View\View;
+
+class ProjectController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index(): View
+    {
+        return view('projects.index');
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create(): View
+    {
+        return view('projects.create');
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Project $project): View
+    {
+        return view('projects.show', ['project' => $project]);
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Project $project): View
+    {
+        return view('projects.edit', ['project' => $project]);
+    }
+}

app/Models/Project.php

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+<?php
+
+namespace App\Models;
+
+use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Project extends Model
+{
+    use SoftDeletes;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<int, string>
+     */
+    protected $fillable = [
+        'customer_id',
+        'name',
+        'project_number',
+        'description',
+        'start_date',
+        'end_date',
+    ];
+
+    /**
+     * The attributes that are appended with attribute getters.
+     *
+     * @var string[]
+     */
+    protected $appends = [
+        'start',
+        'end',
+    ];
+
+    /**
+     * Get the end_date attribute in local format.
+     */
+    public function getStartAttribute(): string
+    {
+        return (is_null($this->start_date)) ? '' : Carbon::createFromFormat('Y-m-d', $this->start_date)->format('d.m.Y');
+    }
+
+    /**
+     * Get the end_date attribute in local format.
+     */
+    public function getEndAttribute(): string
+    {
+        return (is_null($this->end_date)) ? '' : Carbon::createFromFormat('Y-m-d', $this->end_date)->format('d.m.Y');
+    }
+
+    /**
+     * Get the customer this project belongs to.
+     */
+    public function customer(): BelongsTo
+    {
+        return $this->belongsTo(Customer::class);
+    }
+}