docs: add diagrams for identity map, intercepting filter, interpreter, iterator

identity-map/README.md

@@ -31,6 +31,10 @@ Wikipedia says
 
 > In the design of DBMS, the identity map pattern is a database access design pattern used to improve performance by providing a context-specific, in-memory cache to prevent duplicate retrieval of the same object data from the database.
 
+Sequence diagram
+
+![Identity Map sequence diagram](./etc/identity-map-sequence-diagram.png)
+
 ## Programmatic Example of Identity Map Pattern in Java
 
 For the purpose of this demonstration in Java programming, assume we have already created a database instance, showcasing the Identity Map pattern to avoid duplicate objects in memory.

interpreter/README.md

@@ -32,6 +32,10 @@ Wikipedia says
 
 > In computer programming, the interpreter pattern is a design pattern that specifies how to evaluate sentences in a language. The basic idea is to have a class for each symbol (terminal or nonterminal) in a specialized computer language. The syntax tree of a sentence in the language is an instance of the composite pattern and is used to evaluate (interpret) the sentence for a client.
 
+Sequence diagram
+
+![Interpreter sequence diagram](./etc/interpreter-sequence-diagram.png)
+
 ## Programmatic Example of Interpreter Pattern in Java
 
 To be able to interpret basic math in Java, we need a hierarchy of expressions. The `Expression` class is the base, and concrete implementations like `NumberExpression` handle specific parts of the grammar. The Interpreter pattern in Java simplifies parsing and evaluating arithmetic expressions by translating them into a structured format that the application can process.
@@ -174,10 +178,6 @@ Executing the program produces the following console output.
 13:33:15.440 [main] INFO com.iluwatar.interpreter.App -- result: 8
 ```
 
-## Detailed Explanation of Interpreter Pattern with Real-World Examples
-
-![Interpreter](./etc/interpreter_1.png "Interpreter")
-
 ## When to Use the Interpreter Pattern in Java
 
 Use the Interpreter design pattern when there is a language to interpret, and you can represent statements in the language as abstract syntax trees. The Interpreter pattern works best when

iterator/README.md

@@ -35,6 +35,10 @@ Wikipedia says
 
 > In object-oriented programming, the iterator pattern is a design pattern in which an iterator is used to traverse a container and access the container's elements.
 
+Sequence diagram
+
+![Iterator sequence diagram](./etc/iterator-sequence-diagram.png)
+
 ## Programmatic Example of Iterator Pattern in Java
 
 The main class in our Java Iterator Design Pattern example is the `TreasureChest` that contains items. This demonstrates how to implement and use iterators for efficient collection traversal in Java.