Documents and Documentation (beta 1) (#23)

- Change to SQLite document store
- Complete documentation on usage of Feed Reader Central
- Update INSTALLING.md for new installation procedures

Reviewed-on: #23

src/lib/Table.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace FeedReaderCentral;
+
+/**
+ * Constants to use when accessing tables
+ */
+class Table
+{
+    /** @var string The user table */
+    public const USER = 'frc_user';
+
+    /** @var string The feed table */
+    public const FEED = 'feed';
+
+    /** @var string The item table */
+    public const ITEM = 'item';
+}