feat(yaml): Finished YAML Provider

providers/yaml/src/test/java/sample/SampleTest.java

@@ -0,0 +1,24 @@
+package sample;
+
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.yaml.YAMLConfigFactory;
+import org.junit.Test;
+
+public class SampleTest {
+
+    @Test
+    public void test() {
+        // 1. Make a configuration provider from a file.
+        ConfigurationHolder<?> holder = YAMLConfigFactory.from("target/config.yml")
+                .resourcePath("configs/sample.yml")
+                .indent(4) // Optional: Set the indentation of the configuration file.
+                .build();
+
+        // 2. Initialize the configuration classes or instances.
+        holder.initialize(SampleConfig.class);
+        // 3. Enjoy using the configuration!
+        SampleConfig.ENABLED.set(false);
+        System.out.println("Your name is " + SampleConfig.INFO.NAME.resolve() + " (age=" + SampleConfig.INFO.AGE.resolve() + ")!");
+    }
+
+}