Add initial documentation

Closes #70

docs/README.md

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+# Quick Start
+
+## Vision GUI
+
+Vision GUI is a minimal GUI API for Paper.
+
+### Quick Links
+
+* [API Javadoc](https://repo.sparky983.me/javadoc/snapshots/me/sparky983/vision/vision-api/0.2-SNAPSHOT)
+* [Paper Javadoc](https://repo.sparky983.me/javadoc/snapshots/me/sparky983/vision/vision-paper/0.2-SNAPSHOT)
+
+### Installation
+
+Add the following to your build configuration:
+
+{% tabs %}
+{% tab title="pom.xml" %}
+```markup
+<dependencies>
+    <dependency>
+        <groupId>me.sparky983.vision</groupId>
+        <artifactId>vision-paper</artifactId>
+        <version>0.1</version>
+    </dependency>
+</dependencies>
+    
+<repositories>
+    <repository>
+        <id>sparky983</id>
+        <url>https://repo.sparky983.me</url>
+    </repository>
+</repositories>
+```
+{% endtab %}
+
+{% tab title="build.gradle" %}
+```groovy
+repositories {
+    maven { url 'https://repo.sparky983.me' }
+}
+
+dependencies {
+    implementation 'me.sparky983.vision:vision-paper:0.1'
+}
+```
+{% endtab %}
+
+{% tab title="build.gradle.kts" %}
+```kotlin
+repositories {
+    maven("https://repo.sparky983.me")
+}
+
+dependencies {
+    implementation("me.sparky983.vision:vision-paper:0.1")
+}
+```
+{% endtab %}
+{% endtabs %}
+
+### Hello World GUI
+
+First create an instance of the Vision API.
+
+{% tabs %}
+{% tab title="Java" %}
+```java
+PaperVision vision = PaperVision.create(plugin);
+```
+{% endtab %}
+
+{% tab title="Kotlin" %}
+```kotlin
+val vision = PaperVision.create(plugin)
+```
+{% endtab %}
+{% endtabs %}
+
+Then create the GUI:
+
+{% tabs %}
+{% tab title="Java" %}
+```java
+Gui gui = Gui.gui()
+        .title(Component.text("Hello World"))
+        .rows(3)
+        .button(Slot.of(1, 4), Button.button()
+                .name(Component.text("Hello World"))
+                .type(ItemType.STONE)
+                .onClick((click) -> {
+                    click.clicker().sendMessage(Component.text("Hello World"));
+                }));
+```
+{% endtab %}
+
+{% tab title="Kotlin" %}
+```kotlin
+val gui = Gui.gui()
+        .title(Component.text("Hello World"))
+        .rows(3)
+        .button(Slot.of(1, 4), Button.button()
+                .name(Component.text("Hello World"))
+                .type(ItemType.STONE)
+                .onClick {
+                    it.clicker().sendMessage(Component.text("Hello World")) 
+                })
+```
+{% endtab %}
+{% endtabs %}
+
+This code creates a GUI with a button that when the button clicked sends a "Hello World" message to the player.
+
+And finally open the GUI:
+
+{% tabs %}
+{% tab title="Java" %}
+```java
+vision.open(player, gui);
+```
+{% endtab %}
+
+{% tab title="Kotlin" %}
+```kotlin
+vision.open(player, gui)
+```
+{% endtab %}
+{% endtabs %}

docs/SUMMARY.md

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+# Table of contents
+
+* [Quick Start](README.md)