docs: add CONTENT.md for README generation

Author: intisy

CONTENT.md

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+## Core
+<b>AbstractAddon</b>: An implementation of JavaPlugin
+which you will need to extend for many of the other features to work.
+It provides multiple utility methods and does some basic setup for you.
+
+<b>AddonConfig</b>: is an implementation of YamlConfiguration
+which makes comments available in the user's config
+and provides utility methods such as getting a value from within a range
+and removing unused/old keys from the user's config.
+
+## Common
+<b>CoolDowns</b>: A utility object for keeping track of cool downs of players/uuids
+
+<b>PersistentType</b>: Contains some PersistentDataTypes for
+ItemStack's, ItemStack Array's, Locations, and String Arrays.
+Also provides a constructor for PersistentDataType that uses lambda parameters.
+
+<b>Events</b>: Contains static utility methods for registering listeners, creating handlers, and calling events
+
+<b>Scheduler</b>: Contains static utility methods for running and repeating tasks
+
+## Commands
+<b>AddonCommand</b>: allows you to add commands easily with a parent-child structure,
+so you could have a command with a sub command which has a sub command.
+It also adds some default commands such as an addon info, aliases, and help command.
+
+## Groups
+<b>MultiGroup</b>: An implementation of ItemGroup which lets you organize your groups into SubGroups
+
+<b>SubGroup</b>: An ItemGroup that is hidden from the main page, for use in MultiGroup
+
+## Machines
+<b>MenuBlock</b>: A SlimefunItem with a menu, providing overridable methods for setting up the menu
+
+<b>TickingMenuBlock</b>: A MenuBlock with slimefun ticker
+
+<b>AbstractMachineBlock</b>: A TickingMenuBlock which implements EnergyNetComponent and provides a process method
+
+<b>MachineBlock</b>: An AbstractMachineBlock which makes it easy to create simple input-output machines
+
+## Future Additions
+<b>Translation Utility</b>: Some sort of easy way to create translatable strings for your addon's and infinitylibs's strings
+
+<b>InfinityLib Metrics</b>: Metrics to see which versions or even classes are being used
+
+# How to use
+
+First you need to add InfinityLib to the `dependencies` section in your `pom.xml`:
+
+```xml
+<dependency>
+    <groupId>io.github.mooy1</groupId>
+    <artifactId>InfinityLib</artifactId>
+    <version>SPECIFY VERSION HERE</version>
+    <scope>compile</scope>
+</dependency>
+```
+
+Then you need to relocate it into your own package so that it doesn't conflict with other addon's classes.
+
+Under the `build` section in your `pom.xml`, you should have the following:
+
+```xml
+<plugins>
+    <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.2.4</version>
+        <configuration>
+            <!-- This will exclude any unused classes from libraries to reduce file size, not required -->
+            <minimizeJar>true</minimizeJar>
+            <relocations>
+                <!-- This is the relocation, make sure to replace the package name, REQUIRED -->
+                <relocation>
+                    <pattern>io.github.mooy1.infinitylib</pattern>
+                    <shadedPattern>YOUR.MAIN.PACKAGE.HERE.infinitylib</shadedPattern>
+                </relocation>
+            </relocations>
+            <filters>
+                <filter>
+                    <artifact>*:*</artifact>
+                    <excludes>
+                        <exclude>META-INF/*</exclude>
+                    </excludes>
+                </filter>
+            </filters>
+        </configuration>
+        <executions>
+            <execution>
+                <phase>package</phase>
+                <goals>
+                    <goal>shade</goal>
+                </goals>
+            </execution>
+        </executions>
+    </plugin>
+</plugins>
+```
+
+Then change your main plugin class to extend `AbstractAddon` and implement the constructor.
+You will need to use `enable()` and `disable()` instead of `onEnable()` and `onDisable`.
+Make sure you don't call `super.onEnable/Disable`.
+Your updater and config setup is now handled, make sure to test that it's working though!