Add PostgreSQL DB driver (#52)

src/TenantDatabaseManagers/PostgreSQLDatabaseManager.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Stancl\Tenancy\TenantDatabaseManagers;
+
+use Illuminate\Support\Facades\DB;
+use Stancl\Tenancy\Interfaces\TenantDatabaseManager;
+
+class PostgreSQLDatabaseManager implements TenantDatabaseManager
+{
+    public function createDatabase(string $name): bool
+    {
+        return DB::statement("CREATE DATABASE $name WITH TEMPLATE=template0");
+    }
+
+    public function deleteDatabase(string $name): bool
+    {
+        return DB::statement("DROP DATABASE $name");
+    }
+}