Update usage.md

Signed-off-by: Ryder Belserion <[email protected]>

docs/plugins/crazycrates/api/usage.md

@@ -10,4 +10,27 @@ pagination_prev: null
 
 sidebar_label: API Usage
 ---
-https://github.com/Crazy-Crew/ExamplePlugin -> An example of how to use the CrazyCrates API.
+## Add virtual keys to a player
+```java
+UserManager userManager = CratesProvider.get().getUserManager():
+
+userManager.addKeys(5, uuid, "CrateName", KeyType.virtual_key);
+```
+
+## Add physical keys to a player
+```java
+UserManager userManager = CratesProvider.get().getUserManager():
+
+userManager.addKeys(5, uuid, "CrateName", KeyType.physical_key);
+```
+
+## Update or add how many times a player has opened a crate.
+```java
+UserManager userManager = CratesProvider.get().getUserManager():
+
+userManager.addOpenedCrate(uuid, "CrateName");
+```
+
+## An example of the api in use in a plugin.
+> https://github.com/Crazy-Crew/ExamplePlugin/tree/main
+> You can compile the plugin using ./gradlew assemble