[R] Add example code

Author: hykilpikonna

documentation/README.en-us.md

@@ -8,7 +8,7 @@
   <h5 align="center">
 <a href="#basics">Basic Info</a>&nbsp;&nbsp;
 <a href="#maven">Maven Import</a>&nbsp;&nbsp;
-<a href="#development">Development</a>&nbsp;&nbsp;
+<a href="#usage">Usage</a>&nbsp;&nbsp;
 <a href="#license">License</a>
 </h5>
   <br>
@@ -55,3 +55,63 @@ Then you can add this library as dependency:
 ```
 
 Make sure you reimport if you're using IntelliJ IDEA!
+
+<br>
+
+<a name="usage"></a>
+Usage:
+--------
+
+#### 1. Create a HyConfig Object:
+
+```java
+// Pass in only the java.io.File object that stores the config file path.
+// This will load automatically after the object is initialized.
+// Read only will be enabled by default, use config.setEnableWrite(true); to enable write.
+HyConfig config = new HyConfig(new File("./config.yml"));
+```
+
+#### 2. Use it:
+
+```yml
+# Example YML:
+Test:
+  TestString: StringValue1
+  TestInt: 2
+  TestDouble: 3.5
+  TestStringList:
+  - hi
+  - there
+```
+
+```java
+// Code to read Example YML
+
+// Read Config
+// Comment before each variable represents their value.
+
+// "StringValue1"
+String testString = config.getString("Test.TestString");
+
+// 2
+int testInt = config.getInt("Test.TestInt");
+
+// ["hi", "there"]
+List<String> testList = config.getStringList("Test.TestStringList");
+
+// ["TestString", "TestInt", "TestDouble", "TestStringList"]
+ArrayList<String> keysUnderTest = config.getKeys("Test");
+
+
+// Write Config
+// Set value requires enableWrite to be true, if not, calling save() won't do anything.
+// All comments will be removed when saving.
+config.setEnableWrite(true);
+config.set("Test.TestSetString", "TestValue");
+config.save();
+
+
+// Enable Auto Backup
+// This will take up a lot of space because it creates a new backup every time save() is called.
+config.setBackupDir(new File("./backups/"));
+```