Added Category model, resource and its API.

Updated Company model to have Categories.

app/Http/Controllers/API/v2/CategoryController.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Http\Controllers\API\v2;
+
+use App\Http\Requests\StoreCategoryRequest;
+use App\Http\Requests\UpdateCategoryRequest;
+use App\Models\Category;
+use Illuminate\Http\Request;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\API\v2\CategoryResource;
+use App\Http\Resources\API\v2\CategoryCollection;
+
+class CategoryController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index()
+    {
+        return new CategoryCollection(Category::all());
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create()
+    {
+        //
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(StoreCategoryRequest $request)
+    {
+        //
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Category $category)
+    {
+        return new CategoryResource($category);
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Category $category)
+    {
+        //
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(UpdateCategoryRequest $request, Category $category)
+    {
+        //
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Category $category)
+    {
+        //
+    }
+}