feat(docs): add links and code example to usecases and quick-start

Added links to ArchGuard, UnitGen, and ChocolateFactory in the usecases.md file to provide more information about these tools. Also, added a code example in the quick-start.md file to demonstrate how to use the AST in Java.

chapi-ast-cpp/build.gradle.kts

@@ -21,8 +21,8 @@ dependencies {
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2")
 
     implementation(kotlin("stdlib-jdk8"))
+    // Kotlin's reflection.
     implementation(kotlin("reflect"))
-    // Kotlin reflection.
     testImplementation(kotlin("test"))
 
     // JUnit 5

docs/quick-start.md

@@ -61,3 +61,16 @@ public static void main(String[] args) {
 }
 ```
 
+## 3. Use the AST
+
+Use the following code to use the AST:
+
+```java
+import chapi.ast.javaast.JavaAnalyser;
+
+// main
+public static void main(String[] args) {
+    JavaAnalyser analyser = new JavaAnalyser();
+    List<CodeContainer> containerList= analyser.parse("public class HelloWorld { public static void main(String[] args) { System.out.println(\"Hello, World\"); } }", "HelloWorld.java");
+    // handle the containerList
+```

docs/usecases/usecases.md

@@ -6,3 +6,11 @@ has_children: true
 permalink: /usecases
 ---
 
+- [ArchGuard](https://github.com/archguard/archguard) - ArchGuard is an architecture workbench, also for architecture
+  governance, which can analysis architecture in container, component, code level, create architecture fitness
+  functions,
+  and analysis system dependencies.
+- [UnitGen](https://github.com/unit-mesh/unit-gen) is a code fine-tuning data framework that generates data from your
+  existing codebase.
+- [ChocolateFactory](https://github.com/unit-mesh/chocolate-factory) is a cutting-edge LLM toolkit designed to empower
+  you in creating your very own AI assistant.