docs: added a somewhat complete README.md

README.md

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+# guestbook.rs
+a super simple guestbook to deploy on your site: just grab the binary and run it, or configure it to your liking
+
+see it in action (with a custom frontend) [here, at the bottom](https://alemi.dev/), or try an in-memory temporary version [here](https://guestbook.alemi.dev/)
+
+# why
+i love small web and i want to give a way to whoever visits my site to leave a mark. cooking something to do that is very easy, but after connecting my third bare form i decided i needed something more convenient.
+
+# deploy
+## all-in-one
+`guestbook.rs` can be easily deployed without anything else: just grab (or compile) the default binary and run it:
+    $ guestbook serve
+
+it will create a sqlite database (`guestbook.db`) in current directory and start serving its frontend on http://localhost:37812/ and its backend on http://localhost:37812/api
+
+all comments will be public and will only be logged on console
+
+## simple configuration
+it's possible to configure frontend style, extra notifiers and page overrides with a `.toml` config file
+
+if no config file is provided, the implicit default will be used (view it with `guestbook config` or redirect it to file and start editing)
+
+a custom config file can be specified with `-c / --config` CLI argument
+
+### overrides
+by default each user is given full control on each page (except for the `date` field). this can be changed with overrides.
+
+as an example, you may want to review posts before showing them publicly.
+
+add following section to your `config.toml`:
+    [overrides]
+    public = false
+
+and each incoming page will be forced to be private (until you make it public manually with `guestbook review`)
+
+## modular configuration
+`guestbook.rs` just works, but can also be deeply customized
+
+by default all supported sql drivers are included, but it's possible to only compile your desired driver by enabling only that feature (`sqlite`, `postgres`, `mysql`)
+
+all notifiers are bundled, but just like db drivers it's possible to only include some (`email`, `telegram`)
+
+the integrated frontend is not necessary, and can be excluded by disabling the `web` feature. serve your favorite page and just use the `/api` endpoint for fetching pages.
+
+### making your own frontend
+the JS file used by the builtin frontend is available here:
+    https://cdn.alemi.dev/guestbook/0.2.0.js
+
+this provides a plain JS (+jsdoc! check type hints) module exporting one function to hook the automatic infinite scroll fetcher
+
+you can also manage things with your framework of choice, just `GET /api?offset=x&limit=y` to receive a list of public pages
+    class GuestbookPage {
+        id: number
+        author: string
+        contact: string | undefined
+        url: string | undefined
+        avatar: string
+        body: string,
+        date: Date,
+    }
+
+inserting a new page can be done with either a `POST` (+form) or a `PUT` (+json) request on `/api` endpoint
+    class GuestbookInsertion {
+        body: string,
+        author: string | undefined,
+        contact: string | undefined,
+        public: boolean | undefined,
+        date: Date | undefined,
+    }
+
+
+# future work
+due to the modular structure of notifiers, i plan to add many more notifiers for various services, such as
+ * matrix
+ * mastodon/pleroma
+ * discord
+ * ??? open to ideas (: