Feature: Added information on consumer in readme file.

Author: syedumerahmedcode

README.md

@@ -82,6 +82,14 @@ A callback is some code that you pass to a given method, so that it can be calle
 
 ## Explanation Consumer
 
+- **Consumer<T>**: Represents an operation that accepts a single input argument and returns no result. It is similar to a void function when compared to imperative implementation.
+
+This is implemented is Consumer class in the project. In the consumer class, a consumer object is created which takes Customer as input and prints the information on the command line. In the main method, the consumer is called via __accept() function__.
+
+Similar to Consumer, one can also create BiConsumer which takes two parameters as input(instead of one) but like consumer does not return any output.
+
+**Reference:** The source code for the Consumer is present in [Callback.java](https://github.com/syedumerahmedcode/java-functional-programming/blob/master/src/main/java/com/umer/javafunctional/functionalinterface/_Consumer.java) class.
+
 - Add a picture linking imperative and declarative approach together.
 
 ## Explanation Function