Add HashtagFollow model, migration and controller

app/HashtagFollow.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class HashtagFollow extends Model
+{
+    //
+}

app/Http/Controllers/HashtagFollowController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+class HashtagFollowController extends Controller
+{
+    //
+}

database/migrations/2019_07_05_034644_create_hashtag_follows_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateHashtagFollowsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('hashtag_follows', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->bigInteger('user_id')->unsigned()->index();
+            $table->bigInteger('profile_id')->unsigned()->index();
+            $table->bigInteger('hashtag_id')->unsigned()->index();
+            $table->unique(['user_id', 'profile_id', 'hashtag_id']);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('hashtag_follows');
+    }
+}