feat: add readme file

README.md

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+## Pica
+
+A lightweight Dialog API for [Minestom](https://minestom.net/), built around Minecraft's native dialog system.
+
+### Usage
+
+Dialogs are built via `DialogType` and opened directly on a `Player`. The template is associated via a key from Adventure.
+
+```java
+DialogTemplate dialog = DialogType.confirm(MY_KEY)
+    .meta(meta -> {
+        meta.title(Component.text("Confirm deletion"));
+        meta.closeWithEscape(false);
+        meta.afterAction(DialogAfterAction.CLOSE);
+        meta.messageBody(body -> body.width(400).contents(Component.text("This action cannot be undone!", NamedTextColor.RED)));
+    })
+    .yesButton(button -> button.label(Component.text("Yes")).action(myAction))
+    .noButton(button -> button.label(Component.text("No")))
+    .build();
+
+dialog.open(player);
+```
+
+Dialogs can optionally be tracked via a `DialogRegistry`:
+
+```java
+DialogRegistry registry = DialogRegistry.of();
+registry.add(dialog);
+registry.get(MY_KEY).open(player);
+```
+
+### Limitations
+
+Currently only confirmation dialogs (`DialogType.confirm`) are supported. Support for further Minecraft dialog types is planned.