Add installation instructions

docs/Self-Hosting and Development/Installing.md

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+# Installing
+
+0. Setup a LAMP server with PHP 7.2, including PHP extensions mbstring, zip, gd, and imagick
+1. Copy `settings.template.php` to `settings.php`
+2. Import `database.sql` into your database server
+3. Edit `settings.php` and fill in your DB info
+4. Set the URL of the install
+5. Setup "EXTERNAL_APPS" with specifics for your install.
+6. Setup the email settings to receive alerts you configure later in ManagePanel
+7. Run `composer install` (or `composer.phar install`) to install dependency libraries
+8. Edit the database table `apikeys` and add some API keys for the other apps to use
+9. From a web browser, visit `http://apps/url` (or whatever your setup is).  If you did everything right, you should see a login screen.
+10. Now go to `http://apps/url/setup.php` and create an admin account.
+11. Install [ManagePanel](https://source.netsyms.com/Business/ManagePanel) to setup additional user accounts.