Update Singleton vs Prototype.md

Author: withinJoel

Basics of SpringBoot/Singleton vs Prototype.md

@@ -1,3 +1,24 @@
+# Singleton Scope
+## Definition:
+
+* A singleton scope means that only one instance of a bean is created and used throughout the entire application context. This instance is shared across the application.
+## Characteristics:
+
+* Single Instance: Only one instance of the bean is created, and this instance is reused throughout the application.
+* Memory Efficiency: It saves memory and resources since only one instance is created and managed.
+* Shared State: Any state or changes to the bean are shared across all consumers. This can be problematic if the bean maintains mutable state, as changes can affect all parts of the application using the bean.
+## Use Cases:
+
+* Stateless Beans: Ideal for beans that are stateless or where shared state is acceptable.
+* Performance: Useful for beans that are expensive to create, such as database connections or configuration objects.
+## example
+```
+@Component
+@Scope("singleton")
+public class SingletonBean {
+    // Bean instance is shared across the application context
+}
+```
 # Prototype Scope
 ## Definition: