add Ideas CRUD

* add MVC structure
* add migration

admin/Controller/Idea.php

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+<?php
+/**
+ * Copyright (c) 2018. JoomPlace, all rights reserved
+ */
+
+namespace Joomplace\Component\Roadmap\Admin\Controller;
+
+
+use Joomplace\X\Controller;
+use Joomplace\X\Helper\Restful;
+
+class Idea extends Controller
+{
+    use Restful;
+}

admin/Model/Idea.php

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+<?php
+/**
+ * Copyright (c) 2018. JoomPlace, all rights reserved
+ */
+
+namespace Joomplace\Component\Roadmap\Admin\Model;
+
+
+use Joomplace\X\Model;
+
+class Idea extends Model
+{
+    protected $fillable = ['title', 'description', 'project_id'];
+}

admin/migrations/2018_09_10_010431_create_ideas_table.php

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+<?php
+/**
+ * Copyright (c) 2018. JoomPlace, all rights reserved
+ */
+
+use Illuminate\Database\Capsule\Manager as DB;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+class CreateIdeasTable extends Migration
+{
+    public function up()
+    {
+        $model = new \Joomplace\Component\Roadmap\Admin\Model\Idea();
+        DB::schema()->create($model->getTable(), function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('title');
+            $table->string('description');
+            $table->integer('project_id', false, true)->comment('id of the related project');
+            $table->timestamps();
+        });
+    }
+}

admin/view/Idea/Html.php

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+<?php
+/**
+ * Copyright (c) 2018. JoomPlace, all rights reserved
+ */
+
+namespace Joomplace\Component\Roadmap\Admin\view\Idea;
+
+
+use Joomplace\X\Renderer\Edge;
+use Joomplace\X\View;
+
+class Html extends View
+{
+    use Edge;
+}