Add installation dox

INSTALLING.md

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+# Installation
+
+## All Environments (FrankenPHP)
+
+The easiest way to get up and running quickly is by using [FrankenPHP](https://frankenphp.dev), a version of [Caddy](https://caddyserver.com) that runs PHP in its process. There is a `Caddyfile` in the `/src` directory which will configure the site to run with FrankenPHP.
+
+For Linux / Mac users:
+- Follow [their instructions](https://frankenphp.dev/docs/#standalone-binary) for downloading a binary for your system
+- Rename that binary to `frankenphp` and make it executable (`chmod +x ./frankenphp`)
+- Move that binary to `/usr/local/bin`
+
+For Windows users, the steps are the same; however, the binary should be named `frankenphp.exe` and be placed somewhere within your system's `PATH`.
+
+Once those steps are complete, from the `/src` directory, run `frankenphp run`.
+
+_(More environments will be detailed as part of a later release; an nginx reverse proxy via FastCGI is another common way to run PHP applications)_
+
+## PHP Requirements
+
+This is written to target PHP 8.3, and requires the `curl`, `DOM`, and `SQLite3` modules. _(FrankenPHP contains these modules as part of its build.)_
+
+# Setup and Configuration
+
+## Site Address
+
+The default `Caddyfile` will run the site at `http://localhost:8205`. To change that, change that address on line 5. (Note that if `http` is not specified, Caddy will attempt to obtain and install a server certificate. This may be what you want, but that also could be a source of startup errors.)
+
+## Feed Reader Central Behavior
+
+Within the `/src` directory, there is a file named `user-config.php`. This file is the place for customizations and configuration of the instance's behavior.
+
+### Security Model
+
+There ~~are~~ will be three supported security models, designed around different ways the software may be deployed.
+- `Securty::SINGLE_USER` assumes that all connections to the instance are the same person. There is no password required, and no username or e-mail address will be displayed for that user. This is a good setup for a single user on a home intranet. **DO NOT PUT AN INSTANCE WITH THIS CONFIGURATION ON THE PUBLIC INTERNET!** If you do, you deserve what you get.
+- `Security::SINGLE_USER_WITH_PASSWORD` _(not yet implemented)_ will be the same as the above, but will require a password. This setup is ideal for intranets where the user does not want any other users ending up marking their feeds as read just by browsing them.
+- `Security::MULTI_USER` _(not yet implemented)_ will require a known e-mail address and password be provided to establish the identity of each user. This will be the most appropriate setup for an Internet-facing instance, even if there is only one user.
+
+### Database Name
+
+Data is stored under the `/src/data` directory, and the default database name is `frc.db`. If users want to change that path or file name, the path provided should be relative to `/src/data`, not just `/src`.
+
+### Date/Time Format
+
+The default format for dates and times look like "May 28, 2023 at 3:15pm". Changing the string there will alter the display on the main page and when reading an item. Any [supported PHP date or time token](https://www.php.net/manual/en/datetime.format.php) is supported.

README.md

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-# feed-reader-central
+# Feed Reader Central
 
-A centralized, lightweight feed reader with simple self-hosting
+Feed Reader Central is a lightweight feed reader with simple self-hosting. The self-hosted instance serves as a place where feeds can be read and referenced from different devices.
+
+It is written in vanilla PHP, and uses a SQLite database to keep track of items.
+
+See [INSTALLING.md](/INSTALLING.md) for setup and configuration instructions.