- added nearly all migration files

- added nearly all database seed files

database/migrations/2019_08_28_121520_create_collections_table.php

@@ -0,0 +1,58 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateCollectionsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('collections', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('number', 255)->nullable();
+            $table->string('name', 255)->nullable();
+            $table->string('oai_subset', 255)->nullable();
+            $table->integer('parent_id')->unsigned()->nullable();
+            $table->foreign('parent_id')
+                ->references('id')->on('collections')
+                ->onUpdate('cascade')->onDelete('cascade');
+            $table->boolean('visible')->default(1);
+            $table->boolean('visible_publish')->default(1);
+            $table->timestamps();
+        });
+
+        Schema::create('link_documents_collections', function (Blueprint $table) {
+            // $table->increments('id');
+
+            $table->unsignedInteger('collection_id')->index();
+            $table->foreign('collection_id')
+                ->references('id')->on('collections')
+                ->onDelete('cascade')->onUpdate('cascade'); //detach the relation via code
+
+            $table->unsignedInteger('document_id')->index();
+            $table->foreign('document_id')
+                ->references('id')->on('documents')
+                ->onDelete('cascade')->onUpdate('cascade');
+
+            $table->primary(['collection_id', 'document_id']);
+        });
+    }
+    
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('link_documents_collections');
+        Schema::dropIfExists('collections');
+    }
+}